vue生命周期

发表于

最近项目中遇到了vue生命周期的问题

😂

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Home.vue

<template>
  <div class="home">
    <img alt="Vue logo" src="../assets/logo.png">
    <HelloWorld msg="Welcome to Your Vue.js App"/>
    <p>home</p>
  </div>
</template>

<script>
// @ is an alias to /src
import HelloWorld from "@/components/HelloWorld.vue";
export default {
  name: "home",
  components: {
    HelloWorld
  },
  data() {
    return {};
  },
  beforeCreate() {
    console.log("home beforeCreate");
    console.log("el", this.$el);
    console.log("data", this.$data);
    console.log("");
  },
  created() {
    console.log("home created");
    console.log("el", this.$el);
    console.log("data", this.$data);
    console.log("");
  },
  beforeMount() {
    console.log("home beforeMount");
    console.log("el", this.$el);
    console.log("data", this.$data);
    console.log("");
  },
  mounted() {
    console.log("home mounted");
    console.log("el", this.$el);
    console.log("data", this.$data);
    console.log("");
  },
  beforeUpdate() {
    console.log("home beforeUpdate");
    console.log("el", this.$el);
    console.log("data", this.$data);
    console.log("");
  },
  updated() {
    console.log("home updated");
    console.log("el", this.$el);
    console.log("data", this.$data);
    console.log("");
  },
  beforeDestroy() {
    console.log("home beforeDestroy");
    console.log("el", this.$el);
    console.log("data", this.$data);
    console.log("");
  },
  destroyed() {
    console.log("home destroyed");
    console.log("el", this.$el);
    console.log("data", this.$data);
    console.log("");
  }
};
</script>




Helloworld.vue
<template>
  <div class="hello">
    <h1>{{ msg }}</h1>
  </div>
</template>

<script>
export default {
  name: "HelloWorld",
  props: {
    msg: String
  },
  data() {
    return {};
  },
  beforeCreate() {
    console.log("helloworld beforeCreate");
    console.log("el", this.$el);
    console.log("data", this.$data);
    console.log("获取不到msg的值");
    console.log("");
  },
  created() {
    console.log("helloworld created");
    console.log("el", this.$el);
    console.log("data", this.$data);
    console.log(this.msg);
    console.log("");
  },
  beforeMount() {
    console.log("helloworld beforeMount");
    console.log("el", this.$el);
    console.log("data", this.$data);
    console.log(this.msg);
    console.log("");
  },
  mounted() {
    console.log("helloworld mounted");
    console.log("el", this.$el);
    console.log("data", this.$data);
    console.log(this.msg);
    console.log("");
  },
  beforeUpdate() {
    console.log("helloworld beforeUpdate");
    console.log("el", this.$el);
    console.log("data", this.$data);
    console.log(this.msg);
    console.log("");
  },
  updated() {
    console.log("helloworld updated");
    console.log("el", this.$el);
    console.log("data", this.$data);
    console.log(this.msg);
    console.log("");
  },
  beforeDestroy() {
    console.log("helloworld beforeDestroy");
    console.log("el", this.$el);
    console.log("data", this.$data);
    console.log(this.msg);
    console.log("");
  },
  destroyed() {
    console.log("helloworld destroyed");
    console.log("el", this.$el);
    console.log("data", this.$data);
    console.log(this.msg);
    console.log("");
  }
};
</script>

<!-- Add "scoped" attribute to limit CSS to this component only -->
<style scoped>
h3 {
  margin: 40px 0 0;
}
ul {
  list-style-type: none;
  padding: 0;
}
li {
  display: inline-block;
  margin: 0 10px;
}
a {
  color: #42b983;
}
</style>

结果

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/**
home beforeCreate
el undefined
data undefined

home created
el undefined
data {__ob__: Observer}

home beforeMount
el undefined
data {__ob__: Observer}

helloworld beforeCreate
el undefined
data undefined
获取不到msg的值

helloworld created
el undefined
data {__ob__: Observer}
Welcome to Your Vue.js App

helloworld beforeMount
el undefined
data {__ob__: Observer}
Welcome to Your Vue.js App

helloworld mounted
el <div data-v-469af010 class=​"hello">​…​</div>​
data {__ob__: Observer}
Welcome to Your Vue.js App

home mounted
el <div class=​"home">​…​</div>​
data {__ob__: Observer}



home beforeDestroy
el <div class=​"home">​…​</div>​
data {__ob__: Observer}

helloworld beforeDestroy
el <div data-v-469af010 class=​"hello">​…​</div>​
data {__ob__: Observer}
Welcome to Your Vue.js App

helloworld destroyed
el <div data-v-469af010 class=​"hello">​…​</div>​
data {__ob__: Observer}
Welcome to Your Vue.js App

home destroyed
el <div class=​"home">​…​</div>​
data {__ob__: Observer}
 */