详解Vue监听数据变化原理

时间:2020-05-15 阁下长的好生俊俏人气:0

本人最近在学习Vue，从网上查询了很多关于Vue监听数据变化原理，稍微整理精简一下做下分享。

浅度监听

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>浅度监听</title>
  <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=0">
  <meta name="apple-mobile-web-app-capable" content="yes">
  <meta name="apple-mobile-web-app-status-bar-style" content="black">
  <script src="../js/vue1.0.js"></script>
  <script src="../js/vue-resource.js"></script>
  <script>
    window.onload = function(){
      var vm = new Vue({
        el:'#box',
        data:{
          a:111,
          b:2
        }
      });
      vm.$watch('a',function(){
        alert('发生变化了');
      });
      document.onclick = function(){
        vm.a = 1;
      }
    }
  </script>
</head>
<body>
<div id="box">
  {{a}}
  <hr>
  {{b}}
</div>
</body>
</html>

深度监听

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>深度监听</title>
  <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=0">
  <meta name="apple-mobile-web-app-capable" content="yes">
  <meta name="apple-mobile-web-app-status-bar-style" content="black">
  <script src="../js/vue1.0.js"></script>
  <script src="../js/vue-resource.js"></script>
  <script>
    window.onload = function(){
      var vm = new Vue({
        el:'#box',
        data:{
          json:{name:'abcdef',age:'16'},
          b:2
        }
      });
      vm.$watch('json',function(){
        alert('发生变化了');
      },{deep:true});
      document.onclick = function(){
        vm.json.name = "aaaaaa";
      }
    }
  </script>
</head>
<body>
<div id="box">
  {{json | json}}
  <hr>
  {{b}}
</div>
</body>
</html>

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