详解VUE自定义组件中用.sync修饰符与v-model的区别

2019-11-19 13:36:21

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.sync修饰组件

<!DOCTYPE html><html lang="en"><head>  <meta charset="UTF-8">  <title>vue-03</title>  <!-- 引入Vue -->  <link href="https://cdn.bootcss.com/bootstrap/4.1.1/css/bootstrap.min.css" rel="external nofollow" rel="external nofollow" rel="stylesheet">  <script src="https://cdn.bootcss.com/vue/2.5.16/vue.js"></script></head><body>  <div class="container" style="margin-top: 12px;">    <div id="demo" class="row">      {{ say }}      <br />      <my-input :value.sync="say"></my-input>    </div>  </div>  <script>    new Vue({      el: '#demo',      data: {        say: "123"      },      components: {        "my-input": {          props: ['value'],          template: "<div><input v-bind:value='value' v-on:input='change1' />{{value}}</div>",          watch: {            value: function(newValue, oldValue) {              alert('子组件value新旧值' + newValue + '/' + oldValue);              //this.$emit('update:value', newValue)            }          },          methods: {            change1: function(e) {              var v = e.target.value              this.$emit('update:value', v)            },          }        }      },      watch: {        say: function(n, o) {          alert('父组件新旧值' + n + '-' + o)        }      },      methods: {      }    })  </script></body>

v-model修饰组件

<!DOCTYPE html><html lang="en"><head>  <meta charset="UTF-8">  <title>vue-10</title>  <!-- 引入Vue -->  <link href="https://cdn.bootcss.com/bootstrap/4.1.1/css/bootstrap.min.css" rel="external nofollow" rel="external nofollow" rel="stylesheet">  <script src="https://cdn.bootcss.com/vue/2.5.16/vue.js"></script></head><body>  <div class="container" style="margin-top: 12px;">    <div id="demo" class="row">      {{ say }}      <br />      <my-input v-model="say"></my-input>    </div>  </div>  <script>    new Vue({      el: '#demo',      data: {        say: "123"      },      components: {        "my-input": {          props: ['value'],          template: "<div><input v-bind:value='value' v-on:input='change' />{{value}}</div>",          watch: {            value: function(newValue, oldValue) {              alert('子组件value新旧值' + newValue + '/' + oldValue);              //this.$emit('update:value', newValue)            }          },          methods: {            change: function(e) {              this.$emit('input', e.target.value)            }          }        }      }    })  </script></body>

区别只能自己慢慢体会,个人感觉 .sync用法灵活,而v-model只能接受prop名为为value的值.

两者都需要手动触发$emit方法.

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