VUE 监听对象中某一个属性的变化

第一种直接监听对象的属性，写法如下<!DOCTYPE html><html><head><meta charset="UTF-8"><link rel="stylesheet" href="https://unpkg.com/element-ui/lib/theme-chalk/index.cs

alokka

2877人浏览 · 2021-12-16 13:04:12

alokka · 2021-12-16 13:04:12 发布

第一种

直接监听对象的属性，写法如下

<!DOCTYPE html>
<html>
<head>
  <meta charset="UTF-8">
  <!-- import CSS -->
  <link rel="stylesheet" href="https://unpkg.com/element-ui/lib/theme-chalk/index.css">
</head>

<body>
  <div id="app">
    <h1>{{ obj.num }}</h1>
    <button @click="click">点击</button>
  </div>
</body>
<script src="https://unpkg.com/vue/dist/vue.js"></script>
<script>
  new Vue({
    el: '#app',
    data: {
      obj: {
        num: 1,
        name: 'testeg'
      }
    },
    watch: {
      'obj.num'(val) {
        console.log('watch' + val)
      }
    },
    methods: {
      click() {
        this.obj.num++
      }
    }
  })
</script>

</html>

第二种

监听整个对象，配置 deep: true 属性实现深度监测

<!DOCTYPE html>
<html>

<head>
  <meta charset="UTF-8">
  <!-- import CSS -->
  <link rel="stylesheet" href="https://unpkg.com/element-ui/lib/theme-chalk/index.css">
</head>

<body>
  <div id="app">
    <h1>{{ obj.num }}</h1>
    <button @click="click">点击</button>
  </div>
</body>
<script src="https://unpkg.com/vue/dist/vue.js"></script>
<script>
  new Vue({
    el: '#app',
    data: {
      obj: {
        num: 1,
        name: 'testeg'
      }
    },
    watch: {
      obj: {
        handler: function (obj) {
          console.log('watch' + obj.num)
        },
        deep: true
      }
    },
    methods: {
      click() {
        this.obj.num++
      }
    }
  })
</script>

</html>

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