How to use the vue component life cycle-JS Tutorial-php.cn

How to use the vue component life cycle

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Release： 2018-04-14 17:41:02

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This time I will bring you the vue componentlife cycleHow to use it, what are the notes when using the vue component life cycle, the following is a practical case, let's take a look.

Divided into 4 stages:

create/mount/update/destroy

Each stage corresponds to its own processingfunction

create: beforeCreate created

Initialization

mount: beforeMount mounted

Processing related to mounting

update: beforeUpdate updated

Make logical judgments based on the data to be updated

destroy:beforeDestroy destroyed

Cleanup work

Code:

<!doctype html>
<html>
 <head>
 <meta charset="UTF-8">
 <title>生命周期</title>
 <script src="js/vue.js"></script>
 </head>
 <body>
 <p id="container">
  <p>{{msg}}</p>
<!--点击的时候isShow进行取反 -->
  <button @click="isShow = !isShow">切换是否显示组件</button>
  <my-component v-if="isShow"></my-component>
 </p>
 <script>
  Vue.component("my-component",{
   template:`
     <p>
      <button @click="handleClick">Click Me</button>
      <h1>component:{{count}}</h1>
      </p>
   `,
   data:function(){
     return {
      count:0
     }
    },
   methods:{
    handleClick:function(){
     this.count++;
    }
   },
   beforeCreate: function () {
   console.log('准备创建组件');
  },
  created: function () {
   console.log('组件创建完毕');
  },
  beforeMount: function () {
   console.log('组件的模板准备挂载到DOM');
  },
  mounted: function () {
   console.log('挂载完毕');
  },
  beforeUpdate: function () {
   console.log('准备更新了');
  },
  updated:function(){
   console.log('更新完成');
  },
  beforeDestroy: function () {
   console.log('准备destroy');
  },
  destroyed: function () {
   console.log('destroy完成');
  }
  })
  new Vue({
   el:"#container",
   data:{
    msg:"Hello VueJs",
    isShow:true
   }
  })
 </script>
 </body>
</html>

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Life cycle exercises, which stage needs to be written

<!doctype html>
<html>
 <head>
 <meta charset="UTF-8">
 <title>生命周期练习</title>
 <script src="js/vue.js"></script>
 </head>
 <body>
 <p id="container">
  <p>{{msg}}</p>
  <my-component></my-component>
 </p>
 <script>
  Vue.component("my-component",{
   data:function(){
    return {
     myOpacity:0
    }
   },
   template:` <h1 v-bind:style="{opacity:myOpacity}">透明度将改变
   </h1>`,
   mounted:function(){
    setInterval(function(){
     this.myOpacity += 0.1;
     if(this.myOpacity>1){
      this.myOpacity = 0;
     }
    }.bind(this),1000)
   }
  })
  new Vue({
   el:"#container",
   data:{
    msg:"Hello VueJs"
   }
  })
 </script>
 </body>
</html>

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I believe you have mastered the method after reading the case in this article. For more exciting information, please pay attention to other related articles on the PHP Chinese website!