vue学习第四天

Posted asdaa

tags:

篇首语：本文由小常识网(cha138.com)小编为大家整理，主要介绍了vue学习第四天相关的知识，希望对你有一定的参考价值。

一：路由跳转

this.$router.push(‘/course‘);
this.$router.push({name: course});
this.$router.go(-1);
this.$router.go(1);
<router-link to="/course">课程页</router-link>
<router-link :to="{name: ‘course‘}">课程页</router-link>
技术图片 
<template>
    <div class="nav">
        <ul>
            <li :class="{active: currentPage === ‘/‘}">
                <router-link to="/">主页</router-link>
            </li>
            <li :class="{active: currentPage === ‘/course‘}">
                <router-link to="/course">课程</router-link>
            </li>
            <li :class="{active: currentPage === ‘/course_detail‘}">
<!--                路由跳转-->
                <router-link :to="{name: ‘course_detail‘}">课程详情页</router-link>
            </li>
        </ul>
    </div>
</template>

<script>
    export default {
        name: "Nav"
    }
</script>

<style scoped>
    .nav {
        width: 100%;
        height: 60px;
        background-color: black;
    }

    .nav li {
        float: left;
        font: normal 20px/60px ‘微软雅黑‘;
        padding: 0 30px;
    }

    .nav li:hover {
        cursor: pointer;
        background-color: aquamarine;
    }

    .nav li.active {
        cursor: pointer;
        background-color: aquamarine;
    }
</style>
component组件层
技术图片 
<template>
    <div>
        <Nav></Nav>
        <button type="button" @click="goPage(‘/course‘)">跳转课程页面</button>
        <button type="button" @click="gocourse_detail(‘/course_detail‘)">跳转课程详情页面</button>
        <button type="button" @click="goPage(‘/‘)">跳转主页</button>
        <button type="button" @click="goBack">页面前进返回</button>
    </div>
</template>

<script>
    import Nav from "../components/Nav";

    let course_list = [
        {
            id: 1,
            name: ‘Python入门到入土‘
        },
        {
            id: 2,
            name: ‘前端放弃攻略‘
        },
        {
            id: 3,
            name: ‘你最棒，他最强‘
        },
        {
            id: 4,
            name: ‘基佬修炼法则‘
        },
    ];

    export default {
        name: "course",
        components: {
            Nav
        },
        data() {
            return {
                course_list
            }
        },
        methods: {
            goPage(path) {
                let current_path = this.$route.path;
                if (current_path != path) {
                    this.$router.push(path)

                }
            },
            goBack() {
                this.$router.go(-1);
                this.$router.go(1)
            },
             gocourse_detail(){
            // this.$router.push({name:‘course_detail‘})
                    this.$router.push({name: ‘course_detail‘});
        }
        },



    }
</script>

<style scoped>

</style>
View页面层一
技术图片 
<template>
    <div class="">
        <Nav></Nav>
        <button type="button" @click="goPage(‘/course‘)">跳转课程页面</button>
        <button type="button" @click="gocourse_detail(‘/course_detail‘)">跳转课程详情页面</button>
        <button type="button" @click="goPage(‘/‘)">跳转主页</button>
        <button type="button" @click="goBack">页面前进返回</button>
    </div>
</template>

<script>

    import Nav from "../components/Nav";


    export default {
        name: ‘home‘,
        components: {
            Nav,

        },
        methods: {
            goPage(path) {
                let current_path = this.$route.path;
                if (current_path != path) {
                    this.$router.push(path)  // 跳转到页面

                }
            },
            goBack() {
                this.$router.go(-1); // 返回上一页
                this.$router.go(-2);  // 返回上两页

                this.$router.go(1)  // 前进一页
            },
            gocourse_detail(){
                this.$router.push({name: ‘course_detail‘});  // 路由跳转
            }

        }
    }
</script>
View页面层二

二：路由传参

（1）方式一

技术图片 
<template>
    <div class="course-card">
        <h3 @click="goDetail">{{course.name}}</h3>
    </div>
</template>

<script>
    export default {
        name: "CourseCard",
        props: [‘course‘],
        methods:{
            goDetail(){
                this.$router.push({
                    name:‘course_detail‘,
                    query:{id:this.course.id},   // 页面刷新传参不会消失
                    params:{id:this.course.id}  //  页面刷新传参会消失
                })
            }
        }
    }
</script>


<style scoped>
    .course-card h3, .course-card a {
        width: 200px;
        height: 200px;
        border-radius: 50%;
        background-color: coral;
        font: normal 20px/200px ‘STSong‘;
        float: left;
        text-align: center;
        cursor: pointer;
        display: block;
    }
</style>
小组件一
技术图片 
<template>
    <div class="nav">
        <ul>
            <li :class="{active: currentPage === ‘/‘}">
                <router-link to="/">主页</router-link>
            </li>
            <li :class="{active: currentPage === ‘/course‘}">
                <router-link to="/course">课程</router-link>
            </li>
            <li :class="{active: currentPage === ‘/course_detail‘}">
<!--                路由跳转-->
                <router-link :to="{name: ‘course_detail‘}">课程详情页</router-link>
            </li>
        </ul>
    </div>
</template>

<script>
    export default {
        name: "Nav",
        data(){
            return{
                currentPage:‘‘
            }
        },
        created() {
            this.currentPage = this.$route.path
        }
    }
</script>

<style scoped>
    .nav {
        width: 100%;
        height: 60px;
        background-color: black;
    }

    .nav li {
        float: left;
        font: normal 20px/60px ‘微软雅黑‘;
        padding: 0 30px;
    }

    .nav li:hover {
        cursor: pointer;
        background-color: aquamarine;
    }

    .nav li.active {
        cursor: pointer;
        background-color: aquamarine;
    }
</style>
小组件二
技术图片 
<template>
    <div>
        <Nav></Nav>
        <button type="button" @click="goPage(‘/course‘)">跳转课程页面</button>
        <button type="button" @click="gocourse_detail(‘/course_detail‘)">跳转课程详情页面</button>
        <button type="button" @click="goPage(‘/‘)">跳转主页</button>
        <button type="button" @click="goBack">页面前进返回</button>
        <h2>课程页</h2>
        <hr>
        <div>
            <CourseCard v-for="course in course_list" :key="course.name" :course="course"></CourseCard>
        </div>
    </div>
</template>

<script>
    import Nav from "../components/Nav";
    import CourseCard from ‘@/components/CourseCard‘

    let course_list = [
        {
            id: 1,
            name: ‘Python入门到入土‘
        },
        {
            id: 2,
            name: ‘前端放弃攻略‘
        },
        {
            id: 3,
            name: ‘你最棒，他最强‘
        },
        {
            id: 4,
            name: ‘基佬修炼法则‘
        },
    ];

    export default {
        name: "course",
        components: {
            Nav,
            CourseCard
        },
        data() {
            return {
                course_list
            }
        },
        methods: {
            goPage(path) {
                let current_path = this.$route.path;
                if (current_path != path) {
                    this.$router.push(path)

                }
            },
            goBack() {
                this.$router.go(-1);
                this.$router.go(1)
            },
            gocourse_detail() {
                this.$router.push({name: ‘course_detail‘});
            }
        },


    }
</script>

<style scoped>

</style>
页面渲染一
技术图片 
<template>
    <div>
        <Nav></Nav>

        <button type="button" @click="goPage(‘/course‘)">跳转课程页面</button>

        <button type="button" @click="goPage(‘/‘)">跳转主页</button>
        <button type="button" @click="goBack">页面前进返回</button>
        <h2>课程详情页</h2>
        <hr>
        <p> {{course.name}} </p>
        <p> {{course.info}}</p>
        <p> {{course.price}}</p>
    </div>
</template>

<script>
    import Nav from "../components/Nav";

    let course_list = [
        {
            id: 1,
            name: ‘Python入门到入土‘,
            price: 6.66,
            info: ‘三分钟入门，一分钟入土！学了你不吃亏，不学你就废了！‘
        },
        {
            id: 2,
            name: ‘前端放弃攻略‘,
            price: 3.66,
            info: ‘学习前端，忘掉所有痛苦！‘
        },
        {
            id: 3,
            name: ‘你最棒，他最强‘,
            price: 5.22,
            info: ‘别做梦了！‘
        },
        {
            id: 4,
            name: ‘基佬修炼法则‘,
            price: 80000,
            info: ‘就是他，错不了！‘
        },
    ];

    export default {
        name: "Course-detail",
        components: {
            Nav
        },
        data() {
            return {
                course: {},
            }
        },
        methods: {
            goPage(path) {
                let current_path = this.$route.path;
                if (current_path != path) {
                    this.$router.push(path)
                }
            },
            goBack() {
                this.$router.go(-1);
                this.$router.go(1);
            }
        },
        created() {

            let id = this.$route.query.id;  // 接受传参值
            // let id = this.$route.query.id;      // 接受传参值
            for (let courses of course_list) {  // 便利所有的值
                if (id == courses.id) {

                    this.course = courses;


                    break
                }
            }
        }
    }
</script>

<style scoped>

</style>
页面渲染二
技术图片 
<template>
    <div class="">
        <Nav></Nav>
        <button type="button" @click="goPage(‘/course‘)">跳转课程页面</button>
        <button type="button" @click="gocourse_detail(‘/course_detail‘)">跳转课程详情页面</button>

        <button type="button" @click="goBack">页面前进返回</button>
        <h2>主页</h2>
        <hr>
    </div>
</template>

<script>

    import Nav from "../components/Nav";


    export default {
        name: ‘home‘,
        components: {
            Nav,

        },
        methods: {
            goPage(path) {
                let current_path = this.$route.path;
                if (current_path != path) {
                    this.$router.push(path)  // 跳转到页面

                }
            },
            goBack() {
                this.$router.go(-1); // 返回上一页
                this.$router.go(-2);  // 返回上两页

                this.$router.go(1)  // 前进一页
            },
            gocourse_detail() {
                this.$router.push({name: ‘course_detail‘});  // 路由跳转
            }

        }
    }
</script>
页面渲染三

PS：

（1）query：传参的时候刷新页面传参数据不会消失

（2）params：传参的时候刷新页面数据会消失

（2）方式二

技术图片 
<template>
    <div class="nav">
        <ul>
            <li :class="{active: currentPage === ‘/‘}">
                <router-link to="/">主页</router-link>
            </li>
            <li :class="{active: currentPage === ‘/course‘}">
                <router-link to="/course">课程</router-link>
            </li>
            <li :class="{active: currentPage === ‘/course_detail‘}">
<!--                路由跳转-->
                <router-link :to="{name: ‘course_detail‘}">课程详情页</router-link>
            </li>
        </ul>
    </div>
</template>

<script>
    export default {
        name: "Nav",
        data(){
            return{
                currentPage:‘‘
            }
        },
        created() {
            this.currentPage = this.$route.path
        }
    }
</script>

<style scoped>
    .nav {
        width: 100%;
        height: 60px;
        background-color: black;
    }

    .nav li {
        float: left;
        font: normal 20px/60px ‘微软雅黑‘;
        padding: 0 30px;
    }

    .nav li:hover {
        cursor: pointer;
        background-color: aquamarine;
    }

    .nav li.active {
        cursor: pointer;
        background-color: aquamarine;
    }
</style>
小组件一
技术图片 
<template>
    <div class="course-card">
        <h3 @click="goDetail">{{course.name}}</h3>
    </div>
</template>

<script>
    export default {
        name: "CourseCard",
        props: [‘course‘],
        methods:{
            goDetail(){
                this.$router.push(
                    this.$router.push(`/course_detail/${this.course.id}`)  // 通过传参id 需要使用``这个双引号可以添加变量
                )
            }
        }
    }
</script>


<style scoped>
    .course-card h3, .course-card a {
        width: 200px;
        height: 200px;
        border-radius: 50%;
        background-color: coral;
        font: normal 20px/200px ‘STSong‘;
        float: left;
        text-align: center;
        cursor: pointer;
        display: block;
    }
</style>
小组件二
技术图片 
<template>
    <div>
        <Nav></Nav>
        <button type="button" @click="goPage(‘/course‘)">跳转课程页面</button>
        <button type="button" @click="gocourse_detail(‘/course_detail‘)">跳转课程详情页面</button>
        <button type="button" @click="goPage(‘/‘)">跳转主页</button>
        <button type="button" @click="goBack">页面前进返回</button>
        <h2>课程页</h2>
        <hr>
        <div>
            <CourseCard v-for="course in course_list" :key="course.name" :course="course"></CourseCard>
        </div>
    </div>
</template>

<script>
    import Nav from "../components/Nav";
    import CourseCard from ‘@/components/CourseCard‘

    let course_list = [
        {
            id: 1,
            name: ‘Python入门到入土‘
        },
        {
            id: 2,
            name: ‘前端放弃攻略‘
        },
        {
            id: 3,
            name: ‘你最棒，他最强‘
        },
        {
            id: 4,
            name: ‘基佬修炼法则‘
        },
    ];

    export default {
        name: "course",
        components: {
            Nav,
            CourseCard
        },
        data() {
            return {
                course_list
            }
        },
        methods: {
            goPage(path) {
                let current_path = this.$route.path;
                if (current_path != path) {
                    this.$router.push(path)

                }
            },
            goBack() {
                this.$router.go(-1);
                this.$router.go(1)
            },
            gocourse_detail() {
                this.$router.push({name: ‘course_detail‘});
            }
        },


    }
</script>

<style scoped>

</style>
页面层一
技术图片 
<template>
    <div>
        <Nav></Nav>

        <button type="button" @click="goPage(‘/course‘)">跳转课程页面</button>

        <button type="button" @click="goPage(‘/‘)">跳转主页</button>
        <button type="button" @click="goBack">页面前进返回</button>
        <h2>课程详情页</h2>
        <hr>
        <p> {{course.name}} </p>
        <p> {{course.info}}</p>
        <p> {{course.price}}</p>
    </div>
</template>

<script>
    import Nav from "../components/Nav";

    let course_list = [
        {
            id: 1,
            name: ‘Python入门到入土‘,
            price: 6.66,
            info: ‘三分钟入门，一分钟入土！学了你不吃亏，不学你就废了！‘
        },
        {
            id: 2,
            name: ‘前端放弃攻略‘,
            price: 3.66,
            info: ‘学习前端，忘掉所有痛苦！‘
        },
        {
            id: 3,
            name: ‘你最棒，他最强‘,
            price: 5.22,
            info: ‘别做梦了！‘
        },
        {
            id: 4,
            name: ‘基佬修炼法则‘,
            price: 80000,
            info: ‘就是他，错不了！‘
        },
    ];

    export default {
        name: "Course-detail",
        components: {
            Nav
        },
        data() {
            return {
                course: {},
            }
        },
        methods: {
            goPage(path) {
                let current_path = this.$route.path;
                if (current_path != path) {
                    this.$router.push(path)
                }
            },
            goBack() {
                this.$router.go(-1);
                this.$router.go(1);
            }
        },
        created() {


            let id = this.$route.params.id;      // 接受传参值
            for (let courses of course_list) {  // 便利所有的值
                if (id == courses.id) {

                    this.course = courses;


                    break
                }
            }
        }
    }
</script>

<style scoped>

</style>
页面层二
技术图片 
<template>
    <div class="">
        <Nav></Nav>
        <button type="button" @click="goPage(‘/course‘)">跳转课程页面</button>
        <button type="button" @click="gocourse_detail(‘/course_detail‘)">跳转课程详情页面</button>

        <button type="button" @click="goBack">页面前进返回</button>
        <h2>主页</h2>
        <hr>
    </div>
</template>

<script>

    import Nav from "../components/Nav";


    export default {
        name: ‘home‘,
        components: {
            Nav,

        },
        methods: {
            goPage(path) {
                let current_path = this.$route.path;
                if (current_path != path) {
                    this.$router.push(path)  // 跳转到页面

                }
            },
            goBack() {
                this.$router.go(-1); // 返回上一页
                this.$router.go(-2);  // 返回上两页

                this.$router.go(1)  // 前进一页
            },
            gocourse_detail() {
                this.$router.push({name: ‘course_detail‘});  // 路由跳转
            }

        }
    }
</script>
页面层三
技术图片 
 {
      path: ‘/course_detail/:id‘,  // 类似于正则表达式
      name: ‘course_detail‘,
      component: course_detail
    },
路由层

PS：

（1）此种方式使用了正则表达式 通过匹配正则传递的参数 进行数据的筛选

三：VUE跨组件传参

（1）方式一：localstorage

技术图片 
    <template>
        <div class="course-card">
            <h3 @click="goDetail">{{course.name}}</h3>
        </div>
    </template>

    <script>
        export default {
            name: "CourseCard",
            props: [‘course‘],
            methods:{
                goDetail(){
                    this.$router.push(
                        {
                            name:‘course_detail‘,
                            query:{id:this.course.id}
                        }  // 通过传参id 需要使用``这个双引号可以添加变量
                    )
                }
            }
        }
    </script>


    <style scoped>
        .course-card h3, .course-card a {
            width: 200px;
            height: 200px;
            border-radius: 50%;
    background-color: coral;
            font: normal 20px/200px ‘STSong‘;
            float: left;
            text-align: center;
            cursor: pointer;
            display: block;
        }
    </style>
小组件一
技术图片 
<template>
    <div class="nav">
        <ul>
            <li :class="{active: currentPage === ‘/‘}">
                <router-link to="/">主页</router-link>
            </li>
            <li :class="{active: currentPage === ‘/course‘}">
                <router-link to="/course">课程</router-link>
            </li>
            <li :class="{active: currentPage === ‘/course_detail‘}">
<!--                路由跳转-->
                <router-link :to="{name: ‘course_detail‘}">课程详情页</router-link>
            </li>
        </ul>
    </div>
</template>

<script>
    export default {
        name: "Nav",
        data(){
            return{
                currentPage:‘‘
            }
        },
        created() {
            this.currentPage = this.$route.path
        }
    }
</script>

<style scoped>
    .nav {
        width: 100%;
        height: 60px;
        background-color: black;
    }

    .nav li {
        float: left;
        font: normal 20px/60px ‘微软雅黑‘;
        padding: 0 30px;
    }

    .nav li:hover {
        cursor: pointer;
        background-color: aquamarine;
    }

    .nav li.active {
        cursor: pointer;
        background-color: aquamarine;
    }
</style>
小组件二
技术图片 
<template>
    <div>
        <Nav></Nav>
        <button type="button" @click="goPage(‘/course‘)">跳转课程页面</button>
        <button type="button" @click="gocourse_detail(‘/course_detail‘)">跳转课程详情页面</button>
        <button type="button" @click="goPage(‘/‘)">跳转主页</button>
        <button type="button" @click="goBack">页面前进返回</button>
        <h2>{{cTitle}}</h2>
        <hr>
        <div>
            <CourseCard v-for="course in course_list" :key="course.name" :course="course"></CourseCard>
        </div>
    </div>
</template>

<script>
    import Nav from "../components/Nav";
    import CourseCard from ‘@/components/CourseCard‘

    let course_list = [
        {
            id: 1,
            name: ‘Python入门到入土‘
        },
        {
            id: 2,
            name: ‘前端放弃攻略‘
        },
        {
            id: 3,
            name: ‘你最棒，他最强‘
        },
        {
            id: 4,
            name: ‘基佬修炼法则‘
        },
    ];

    export default {
        name: "course",
        components: {
            Nav,
            CourseCard
        },
        data() {
            return {
                course_list,
                cTitle: ‘课程页‘
            }
        },
        methods: {
            goPage(path) {
                let current_path = this.$route.path;
                if (current_path != path) {
                    this.$router.push(path)

                }
            },
            goBack() {
                this.$router.go(-1);
                this.$router.go(1)
            },
            gocourse_detail() {
                this.$router.push({name: ‘course_detail‘});
            }
        },
        created() {
            localStorage.cTitle && (this.cTitle = localStorage.cTitle)
        }

    }
</script>

<style scoped>

</style>
页面层一
技术图片 
<template>
    <div>
        <Nav></Nav>

        <button type="button" @click="goPage(‘/course‘)">跳转课程页面</button>

        <button type="button" @click="goPage(‘/‘)">跳转主页</button>
        <button type="button" @click="goBack">页面前进返回</button>
        <h2>课程详情页</h2>
        <p>
            主页:<input type="text" v-model="hTitle">
            <!--            点击修改主页的名称会发生改名-->
            <button @click="changehTitle">修改主页</button>
        </p>
        <p>
            课程页:<input type="text" v-model="cTitle">
            <!--            点击修改课程页的名称会发生改名-->
            <button @click="changecTitle"> 修改课程页</button>
        </p>
        <hr>
        <p> {{course.name}} </p>
        <p> {{course.info}}</p>
        <p> {{course.price}}</p>
    </div>
</template>

<script>
    import Nav from "../components/Nav";

    let course_list = [
        {
            id: 1,
            name: ‘Python入门到入土‘,
            price: 6.66,
            info: ‘三分钟入门，一分钟入土！学了你不吃亏，不学你就废了！‘
        },
        {
            id: 2,
            name: ‘前端放弃攻略‘,
            price: 3.66,
            info: ‘学习前端，忘掉所有痛苦！‘
        },
        {
            id: 3,
            name: ‘你最棒，他最强‘,
            price: 5.22,
            info: ‘别做梦了！‘
        },
        {
            id: 4,
            name: ‘基佬修炼法则‘,
            price: 80000,
            info: ‘就是他，错不了！‘
        },
    ];

    export default {
        name: "Course-detail",
        components: {
            Nav
        },
        data() {
            return {
                course: {},
                hTitle: ‘‘,
                cTitle: ‘‘,
            }
        },
        methods: {
            goPage(path) {
                let current_path = this.$route.path;
                if (current_path != path) {
                    this.$router.push(path)
                }
            },
            goBack() {
                this.$router.go(-1);
                this.$router.go(1);
            },
            changehTitle() {
                this.hTitle && (localStorage.hTitle = this.hTitle);     // 只有this.hTitle为真（也就是输入的有值） 后面的才会成立


            },
            changecTitle() {
                this.cTitle && (localStorage.cTitle = this.cTitle)        // 只有this.cTitle为真（也就是输入的有值） 后面的才会成立
            },

        },
        created() {


            let id = this.$route.query.id;      // 接受传参值
            for (let courses of course_list) {  // 便利所有的值
                if (id == courses.id) {

                    this.course = courses;


                    break
                }
            }
        }
    }
</script>

<style scoped>

</style>
页面层二
技术图片 
<template>
    <div class="">
        <Nav></Nav>
        <button type="button" @click="goPage(‘/course‘)">跳转课程页面</button>
        <button type="button" @click="gocourse_detail(‘/course_detail‘)">跳转课程详情页面</button>

        <button type="button" @click="goBack">页面前进返回</button>
        <h2>{{hTitle}}</h2>
        <hr>
    </div>
</template>

<script>

    import Nav from "../components/Nav";


    export default {
        name: ‘home‘,
        components: {
            Nav,

        },
        data() {
            return {
                hTitle: ‘主页‘

            }
        },
        methods: {
            goPage(path) {
                let current_path = this.$route.path;
                if (current_path != path) {
                    this.$router.push(path)  // 跳转到页面

                }
            },
            goBack() {
                this.$router.go(-1); // 返回上一页
                this.$router.go(-2);  // 返回上两页

                this.$router.go(1)  // 前进一页
            },
            gocourse_detail() {
                this.$router.push({name: ‘course_detail‘});  // 路由跳转
            }

        },
        created() {
            localStorage.hTitle && (this.hTitle = localStorage.hTitle)  // 如果localStorage有值 则使用仓库的 没有值使用默认值
        }
    }
</script>
页面层三

PS:

　　（1）上述课程详情页 更改了主页与课程页面的名称 且刷新之后课程名称不会更改为原有的

　　（2）localstorage存储的是永久的数据

（2）方式二：VUE仓库（store.js）

（1）

技术图片 
<template>
    <div>
        <Nav></Nav>
        <button type="button" @click="goPage(‘/course‘)">跳转课程页面</button>
        <button type="button" @click="gocourse_detail(‘/course_detail‘)">跳转课程详情页面</button>
        <button type="button" @click="goPage(‘/‘)">跳转主页</button>
        <button type="button" @click="goBack">页面前进返回</button>
        <h2>{{cTitle}}</h2>
        <hr>
        <div>
            <CourseCard v-for="course in course_list" :key="course.name" :course="course"></CourseCard>
        </div>
    </div>
</template>

<script>
    import Nav from "../components/Nav";
    import CourseCard from ‘@/components/CourseCard‘

    let course_list = [
        {
            id: 1,
            name: ‘Python入门到入土‘
        },
        {
            id: 2,
            name: ‘前端放弃攻略‘
        },
        {
            id: 3,
            name: ‘你最棒，他最强‘
        },
        {
            id: 4,
            name: ‘基佬修炼法则‘
        },
    ];

    export default {
        name: "course",
        components: {
            Nav,
            CourseCard
        },
        data() {
            return {
                course_list,
                cTitle: ‘课程页‘
            }
        },
        methods: {
            goPage(path) {
                let current_path = this.$route.path;
                if (current_path != path) {
                    this.$router.push(path)

                }
            },
            goBack() {
                this.$router.go(-1);
                this.$router.go(1)
            },
            gocourse_detail() {
                this.$router.push({name: ‘course_detail‘});
            }
        },
        created() {
                
                this.cTitle = this.$store.state.cTitle  // 获取仓库数据
        }

    }
</script>

<style scoped>

</style>
课程页
技术图片 
<template>
    <div>
        <Nav></Nav>

        <button type="button" @click="goPage(‘/course‘)">跳转课程页面</button>

        <button type="button" @click="goPage(‘/‘)">跳转主页</button>
        <button type="button" @click="goBack">页面前进返回</button>
        <h2>课程详情页</h2>
        <p>
            主页:<input type="text" v-model="hTitle">
            <!--            点击修改主页的名称会发生改名-->
            <button @click="changehTitle">修改主页</button>
        </p>
        <p>
            课程页:<input type="text" v-model="cTitle">
            <!--            点击修改课程页的名称会发生改名-->
            <button @click="changecTitle"> 修改课程页</button>
        </p>
        <hr>
        <p> {{course.name}} </p>
        <p> {{course.info}}</p>
        <p> {{course.price}}</p>
    </div>
</template>

<script>
    import Nav from "../components/Nav";

    let course_list = [
        {
            id: 1,
            name: ‘Python入门到入土‘,
            price: 6.66,
            info: ‘三分钟入门，一分钟入土！学了你不吃亏，不学你就废了！‘
        },
        {
            id: 2,
            name: ‘前端放弃攻略‘,
            price: 3.66,
            info: ‘学习前端，忘掉所有痛苦！‘
        },
        {
            id: 3,
            name: ‘你最棒，他最强‘,
            price: 5.22,
            info: ‘别做梦了！‘
        },
        {
            id: 4,
            name: ‘基佬修炼法则‘,
            price: 80000,
            info: ‘就是他，错不了！‘
        },
    ];

    export default {
        name: "Course-detail",
        components: {
            Nav
        },
        data() {
            return {
                course: {},
                hTitle: ‘‘,
                cTitle: ‘‘,
            }
        },
        methods: {
            goPage(path) {
                let current_path = this.$route.path;
                if (current_path != path) {
                    this.$router.push(path)
                }
            },
            goBack() {
                this.$router.go(-1);
                this.$router.go(1);
            },
            changehTitle() {
                this.hTitle && (localStorage.hTitle = this.hTitle);     // 只有this.hTitle为真（也就是输入的有值） 后面的才会成立


            },
            changecTitle() {
                console.log(this.$store);  // 查看仓库数据存储在哪个目录下
                this.$store.state.cTitle = this.cTitle;  // 数据更改

            },

        },
        created() {


            let id = this.$route.query.id;      // 接受传参值
            for (let courses of course_list) {  // 便利所有的值
                if (id == courses.id) {

                    this.course = courses;


                    break
                }
            }
        }
    }
</script>

<style scoped>

</style>
课程详情页
技术图片 
import Vue from ‘vue‘
import Vuex from ‘vuex‘
import cookies from ‘vue-cookies‘


Vue.use(Vuex);
Vue.use(cookies);
export default new Vuex.Store({
  state: {
      cTitle:‘课程页‘
  },
  mutations: {

  },
  actions: {

  }
})
store.js

PS:

　　（1）如上述课程详情页从仓库获取数据更改了课程页的名称

　　（2）刷新更改名称之后的页面 页面名称又恢复之前的页面

　　（3）vue通过仓库存储的数据 不会临时有效刷新就没了

（2）仓库插件

技术图片 
export default new Vuex.Store({
    state: {
        title: ‘默认值‘
    },
    mutations: {
        // mutations 为 state 中的属性提供setter方法
        // setter方法名随意，但是参数列表固定两个：state, newValue
        setTitle(state, newValue) {
            state.title = newValue;
        }
    },
    actions: {}
})
store.js
任意组件给变量赋值
this.$store.state.title = ‘newTitle‘
this.$store.commit(‘setTitle‘, ‘newTitle‘)
任意组件获取变量的值
console.log(this.$store.state.title)

 （3）方式三：cookie

（1）安装

cnpm install vue-cookies  // 安装cookie插件

（2）配置

技术图片
// 第一种
import cookies from ‘vue-cookies‘      // 导入插件
Vue.use(cookies);                    // 加载插件
new Vue({
    // ...
    cookies,                        // 配置使用插件原型 $cookies
}).$mount(‘#app‘);

// 第二种
import cookies from ‘vue-cookies‘    // 导入插件
Vue.prototype.$cookies = cookies;    // 直接配置插件原型 $cookies
PS：推荐使用第二种
技术图片
技术图片 
<template>
    <div class="tst-page">
        <Nav></Nav>
        <h2>测试页面</h2>
        <p>
            <input type="text" v-model="token">
            <button @click="setToken">设置token</button>
        </p>
        <p>
            <button @click="getToken">获取token</button>
        </p>
        <p>
            <button @click="delToken">删除token</button>
        </p>
    </div>
</template>

<script>
    import Nav from ‘@/components/Nav.vue‘

    export default {
        name: "TestPage",
        components: {
            Nav
        },
        data() {
            return {
                token: ‘‘
            }
        },
        methods: {
            setToken() {
                if (this.token) {
                    let token = this.token;
                    this.$cookies.set(‘token‘, token, ‘1d‘); // 设置token 第一个参数是key 第二个参数是值 第三个参数是token生存时间 默认一天
                    console.log(token);
                    this.token = ‘‘
                }
            },
            getToken() {
                this.$cookies.get(‘token‘)  // 获取token
            },
            delToken() {
                this.$cookies.remove(‘token‘)  // 删除token
            },
        }
    }
</script>

<style scoped>

</style>
页面层

 PS：

　　（1）token：用来认证的字符串

　　（2）产生：后台产生

　　（3）存储：后台存储（session表 文件 缓存） 前台存储：cookie

　　（4）使用：服务器生成返回给前台 前台进行认证的时候携带cookie进行认证

　　（5） 前后台分离项目：后台生成token，返回给前台 => 前台自己存储，发送携带token请求 => 后台完成token校验 => 后台得到登陆用户

 四：axios

（1）作用：前后台数据进行交互

（2）安装

cnpm install axios

（3）main.js

import axios from ‘axios‘

Vue.prototype.$axios = axios;

（3）

技术图片 
<template>
    <div class="tst-page">
        <Nav></Nav>
        <h2>测试页面</h2>
        <p>
            用户名称:
            <input type="text" v-model="username">
        </p>
        <p>
            用户密码:
            <input type="text" v-model="password">
        </p>
        <button type="button" @click="axiosAction">后台提交数据</button>

    </div>
</template>

<script>
    import Nav from ‘@/components/Nav.vue‘

    export default {
        name: "TestPage",
        components: {
            Nav
        },
        data() {
            return {
                username: ‘‘,
                password: ‘‘
            }
        },
        methods: {

            axiosAction() {
                // this.$axios({
                //     url: ‘http://127.0.0.1:8000/test/‘,  // 因为不在一个服务器必须写全路径
                //     method: ‘get‘,  // get请求
                //     params: {
                //         username: this.username,
                //         password: this.password,
                //     }
                // })
                this.$axios({
                        url: ‘http://127.0.0.1:8000/test/‘,  // 因为不在一个服务器必须写全路径
                        method: ‘post‘,  // get请求
                        params: {
                            username: this.username,
                            password: this.password,

                        }

                    },
                    this.username = ‘‘,
                    this.password = ‘‘
                )
                    .then(function (response) {  // 回调函数 成功
                        console.log(response)
                    }).catch(function (response) {
                    console.log(response)
                })
            },

        }

    }
</script>

<style scoped>

</style>
前段

五：域间同源问题

技术图片
// 后台接收到前台的请求，可以接收前台数据与请求信息，发现请求的信息不是自身服务器发来的请求，拒绝响应数据，这种情况称之为 - 跨域问题（同源策略 CORS）

// 导致跨域情况有三种
// 1) 端口不一致
// 2) IP不一致
// 3) 协议不一致

// Django如何解决 - django-cors-headers模块
// 1) 安装：pip3 install django-cors-headers
// 2) 注册：
INSTALLED_APPS = [
    ...
    ‘corsheaders‘
]
// 3) 设置中间件：
MIDDLEWARE = [
    ...
    ‘corsheaders.middleware.CorsMiddleware‘
]
// 4) 设置跨域：
CORS_ORIGIN_ALLOW_ALL = True
技术图片

六：element-ui插件

（1）安装：

>: cnpm i element-ui -S

（2）main.js配置

import ElementUI from ‘element-ui‘;
import ‘element-ui/lib/theme-chalk/index.css‘;
Vue.use(ElementUI);

 

以上是关于vue学习第四天的主要内容，如果未能解决你的问题，请参考以下文章

学习Vue第四天

Vue第四天学习笔记之组件化高级

Vue-第四天vue.js事件绑定

十分宠爱-冲刺日志（第四天）

nodejs的第四天学习

学习第十四天（2019-11-27）