1. input 中的 v-model

<!-- 表单双向绑定 -->
<input :value="username" @input="username = $event.target.value" />
<!-- 等于 -->
<input v-model="username" />

2. 自定义组件 v-model

<!-- 组件双向绑定 -->
<!-- 子 -->
<script>
export default {props: {value: {required: true,},},watch: {value(newValue) {this.my_input = newValue;},},data() {return {my_input: this.value,};},methods: {handleChange() {this.$emit("input", this.my_input);},},
};
</script>
<template><el-input v-model="my_input" @change="handleChange"></el-input>
</template><!-- 父 -->
<my-component v-model="username" />