一、什么是VUE
它是一个构建用户界面的JAVASCRITP0框架
二、怎么样使用VUE
1）引入vue.js
<script src=vue.js></script>
2) 展示html
<div id="app">
<input type="text" v-model="msg">
<p>{{msg}}</p>
</div>
3)建立vue对象
new Vue({
el: "#app", //表示在当前这个元素内开始使用VUE
data:{
msg: ""
}
})
三、在元素当中插入值
{{}}，里面可以放表达式
指令：是带有V-前缀的特殊属性，通过属性来操作元素
v-text:在元素当中插入值
v-html:在元素不中不仅可以插入文本，还可以插入标签
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<script src="vue.js"></script>
</head>
<body>
<div id="app">
<p>{{msg}}</p>
<p>{{80+2}}</p>
<p>{{20>30}}</p>
{{msg}}
我是：<h1 v-text="msg">{{str}}</h1>
你是：<h1 v-text="msg">2222222222222</h1>
<h2 v-html="hd"></h2>
<h2 v-html="str"></h2>
</div>
<script>
new Vue({
el: "#app", //表示在当前这个元素内开始使用VUE
data:{
msg: "我是老大",
hd: "<input type=‘button‘ value=‘你是小三‘>",
str: "我要发财!"
}
})
</script>
</body>
</html>
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v-if: 根据表达式的真假值来动态插入和移除元素
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<script src="vue.js"></script>
</head>
<body>
<div id="app">
<p v-if="pick">我是刘德华</p>
<p v-else>我是张学友</p>
<p v-show="temp">我是赵本山</p>
<p v-show="ok">你喜欢我吗？</p>
</div>
<script>
var vm = new Vue({
el: "#app", //表示在当前这个元素内开始使用VUE
data:{
pick: false,
temp: true,
ok: true
}
})
window.setInterval(function(){
vm.ok = !vm.ok;
},1000)
</script>
</body>
</html>
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v-show:根据表达式的真假值来隐藏和显示元素
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<script src="vue.js"></script>
<style>
ul li{
list-style: none;
display: inline-block;
border: 1px solid cornflowerblue;
height:40px;
line-height: 40px;
width: 120px;
text-align: center;
}
</style>
</head>
<body>
<div id="mybox">
<ul>
<li>
<span v-on:click="qh(true)">二唯码登录</span>
</li>
<li>
<span v-on:click="qh(false)">邮箱登录</span>
</li>
</ul>
<div v-show="temp">
<img src="erma.jpg">
</div>
<div v-show="!temp">
<form action="http://mail.163.com" method="post">
<p><input type="email"></p>
<p><input type="password"></p>
<p><input type="submit" value="登录"></p>
</form>
</div>
</div>
<script>
new Vue({
el: "#mybox",
data: {
temp: true
},
methods: {
qh: function (t) {
this.temp = t
}
}
})
</script>
</body>
</html>
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v-for:根据变量的值来循环渲染元素
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<script src="vue.js"></script>
<style>
ul li{
list-style: none;
}
</style>
</head>
<body>
<div id="app">
<ul>
<li v-for="(item,index3) in arr">
{{item}}: {{index3}}
</li>
</ul>
<ul>
<li v-for="(item,key,index) in obj">
{{item}}:{{key}}:{{index}}
</li>
</ul>
<ul>
<li v-for="item in obj2">
{{item.username}}
{{item.age}}
{{item.sex}}
</li>
</ul>
<!--<div v-for="i in 8">-->
<!--{{i}}-->
<!--</div>-->
<input type="button" value="点我吧!" @click="show()">
<a :href="url">我想去百度</a>
</div>
<script>
new Vue({
el: "#app", //表示在当前这个元素内开始使用VUE
data:{
arr: [11,22,3344,55],
obj: {a:"张三",b:"李四",c:"王大拿",d:"谢大脚"},
obj2:[
{username: "jason"},
{age: 20},
{sex: "male"}
],
str: "我来了",
url: "http://www.qq.com"
},
methods: {
show: function () {
this.arr.pop();
}
}
})
</script>
</body>
</html>
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v-on:监听元素事件，并执行相应的操作
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<script src="vue.js"></script>
<style>
ul li{
list-style: none;
display: inline-block;
border: 1px solid cornflowerblue;
height:40px;
line-height: 40px;
width: 120px;
text-align: center;
}
</style>
</head>
<body>
<div id="mybox">
<ul>
<li>
<span v-on:click="qh(true)">二唯码登录</span>
</li>
<li>
<span v-on:click="qh(false)">邮箱登录</span>
</li>
</ul>
<div v-show="temp">
<img src="erma.jpg">
</div>
<div v-show="!temp">
<form action="http://mail.163.com" method="post">
<p><input type="email"></p>
<p><input type="password"></p>
<p><input type="submit" value="登录"></p>
</form>
</div>
</div>
<script>
new Vue({
el: "#mybox",
data: {
temp: true
},
methods: {
qh: function (t) {
this.temp = t
}
}
})
</script>
</body>
</html>
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对数组的操作：
push
pop
shift
unshift
splice
reverse
v-bind:绑定元素的属性来执行相应的操作
v-model:实现了数据和视图的双向绑定
分成了3步：
1）把元素的值和数据相绑定
2）当输入内容时，数据同步发生变化，视图 ---数据的驱动
3）当改变数据时，输入内容也会发生变化，数据-》视图的驱动
自定义指令：
new Vue({
el: "#app", //表示在当前这个元素内开始使用VUE
data:{
},
directives: {
focus: { //指令的名字
//当绑定的元素显示时
inserted: function (tt) {
tt.focus();
}
}
}
金典题型：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<script src="vue.js"></script>
<style>
ul li{
list-style: none;
}
.tipbox{
width: 200px;
height:200px;
border: 1px solid cornflowerblue;
position: absolute;
background-color: #aaaaaa;
top: 200px;
left: 600px;
}
</style>
</head>
<body>
<div id="app">
<div>
<input type="text" placeholder="姓名" v-model="username">
<input type="text" placeholder="年龄" v-model="age">
<input type="button" value="增加" @click="add">
</div>
<div>
<table cellpadding="0" border="1">
<tr v-for="(item,index) in arr">
<td>{{item.username}}</td>
<td>{{item.age}}</td>
<td>{{index}}</td>
<td><input type="button" value="删除" @click="del(index)"></td>
<td><input type="button" value="修改" @click="showBox(index)"></td>
</tr>
</table>
</div>
<div class="tipbox" v-show="isShow">
<p><input type="text" placeholder="姓名" v-model="m_username"></p>
<p><input type="text" placeholder="年龄" v-model="m_age"></p>
<p>
<input type="button" value="确定" @click="save()">
<input type="button" value="取消" @click="cancel()">
</p>
</div>
</div>
<script>
new Vue({
el: "#app", //表示在当前这个元素内开始使用VUE
data:{
username: "",
age: "",
arr: [],
isShow:false,
m_username: "",
m_age: "",
n: 0
},
methods: {
add: function () {
this.arr.push({username:this.username,age: this.age});
console.log(this.arr);
},
del: function (index) {
this.arr.splice(index,1);
},
showBox: function (index) {
this.isShow = true;
this.n = index;
this.m_username = this.arr[index].username;
this.m_age = this.arr[index].age;
},
cancel: function () {
this.isShow = false
},
save: function () {
this.arr[this.n].username = this.m_username;
this.arr[this.n].age = this.m_age;
this.isShow = false
}
}
})
</script>
</body>
</html>
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