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console 命令行工具 X clear

                    
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console
<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <script src="https://cdn.jsdelivr.net/npm/vue@2.6.12/dist/vue.js"></script>
  <title>Document</title>
</head>
<body>
  <div id="app">
    第一次点击会在2s后显示组件,然后将该组件进行缓存,之后就直接显示该组件.
    <br>
    <button @click="show=!show">button</button>
    <child-comp v-if="show"></child-comp>
  </div>
  <script>
    new Vue({
      el: '#app',
      data() {
        return {
          show: false
        }
      },
      components: {
        // 'child-comp': {
        //   template: '<h1>sync component</h1>'
        // }
        'child-comp': (res,rej)=> {
          setTimeout(()=>{res({template: '<h1>async component</h1>'})}, 2000)
        }
      }
    })
  </script>
</body>
</html>