vue 组件之间传值

Posted 2020-11-23 jlyuan

父组件通过 props 传值给子组件，子组件通过 $emit 来通知父组件修改相应的props值，子组件可以通过watch监听父组件值变化。案例如下：

1.子组件

<template>
    <div class="com">
        <input type="text" @input="inputChange" v-model="inputVal">
    </div>
</template>

<script>
    export default {
        name: "myInput",
        props:[‘value‘],
        data(){
            return{
                inputVal:this.value,
            }
        },
        methods:{
            inputChange(){
                // 子组件值改变，通过$emit触发父组件方法，改变父组件值
                this.$emit(‘input‘,this.inputVal)
            }
        },
        watch:{
            // 监听父组件值改变
            value:function(newVal,oldVal){
                this.inputVal = newVal;
            }
        }
    }

</script>
<style scoped>
</style>

2. 父组件

<template>
    <div class="com">
        <button @click="changeName"> change name</button>
        <v-input :value="name" @input="setName"></v-input>
    </div>
</template>

<script>
    import vInput from "@/components/issue/VInput" 
    export default {
        name:"issueCom",
        components:{
            vInput,
        },
        data(){
            return {
                name:"please",
            }
        },
        methods:{
            setName(val){
                this.name = val;
            },
            changeName(){
                this.name += "**";
            }
        }
    }

</script>
<style scoped>
</style>