详解VUE自定义组件中用.sync修饰符与v-model的区别

.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.

以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持。

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