vue生命周期和钩子函数
Posted willem_wg
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阅读目录
阐述
钩子就好像是把人的出生到死亡分成一个个阶段,你肯定是在出生阶段起名字,而不会在成年或者死亡的阶段去起名字。
或者说你想在出生阶段去约炮,也是不行的。组件也是一样,每个阶段它的内部构造是不一样的。所以一般特定的钩子做特定的事,比如 ajax
获取数据就可以在 mounted
阶段。
1、vue生命周期简介
2、生命周期探究
对于执行顺序和什么时候执行,看上面图基本有个了解了。下面我们将结合代码去看看钩子函数的执行。
<!DOCTYPE html>
<html>
<head>
<title>钩子函数</title>
<meta charset="utf-8">
<script src="http://cdn.bootcss.com/vue/2.1.10/vue.js"></script>
<body>
<div id="app">
<p> message </p>
<input type="button" @click="change" value="更新数据" />
<input type="button" @click="destroy" value="销毁" />
</div>
<script type="text/javascript">
var vm = new Vue(
el: '#app',
data:
message : "Welcome Vue"
,
methods:
change()
this.message = 'Datura is me';
,
destroy()
vm.$destroy();
,
beforeCreate: function ()
console.group('beforeCreate 创建前状态===============》');
//undefined
console.log("%c%s", "color:red","el : " + this.$el);
//undefined
console.log("%c%s", "color:red","data : " + this.$data);
//undefined
console.log("%c%s", "color:red","message: " + this.message);
,
created: function ()
console.group('created 创建完毕状态===============》');
//undefined
console.log("%c%s", "color:red","el : " + this.$el);
//[object Object] => 已被初始化
console.log("%c%s", "color:green","data : " + this.$data);
//Welcome Vue => 已被初始化
console.log("%c%s", "color:green","message: " + this.message);
,
beforeMount: function ()
console.group('beforeMount 挂载前状态===============》');
//已被初始化
console.log("%c%s", "color:green","el : " + (this.$el));
// 当前挂在的元素
console.log(this.$el);
//已被初始化
console.log("%c%s", "color:green","data : " + this.$data);
//已被初始化
console.log("%c%s", "color:green","message: " + this.message);
,
mounted: function ()
console.group('mounted 挂载结束状态===============》');
//已被初始化
console.log("%c%s", "color:green","el : " + this.$el);
console.log(this.$el);
//已被初始化
console.log("%c%s", "color:green","data : " + this.$data);
//已被初始化
console.log("%c%s", "color:green","message: " + this.message);
,
beforeUpdate: function ()
alert("更新前状态");
console.group('beforeUpdate 更新前状态===============》');
//这里指的是页面渲染新数据之前
console.log("%c%s", "color:green","el : " + this.$el);
console.log(this.$el);
console.log("%c%s", "color:green","data : " + this.$data);
console.log("%c%s", "color:green","message: " + this.message);
alert("更新前状态2");
,
updated: function ()
console.group('updated 更新完成状态===============》');
console.log("%c%s", "color:green","el : " + this.$el);
console.log(this.$el);
console.log("%c%s", "color:green","data : " + this.$data);
console.log("%c%s", "color:green","message: " + this.message);
,
beforeDestroy: function ()
console.group('beforeDestroy 销毁前状态===============》');
console.log("%c%s", "color:red","el : " + this.$el);
console.log(this.$el);
console.log("%c%s", "color:red","data : " + this.$data);
console.log("%c%s", "color:red","message: " + this.message);
,
destroyed: function ()
console.group('destroyed 销毁完成状态===============》');
console.log("%c%s", "color:red","el : " + this.$el);
console.log(this.$el);
console.log("%c%s", "color:red","data : " + this.$data);
console.log("%c%s", "color:red","message: " + this.message)
)
</script>
</body>
</html>
3、生命周期总结
beforecreate : 举个栗子:可以在这加个loading事件
created :在这结束loading,还做一些初始化,实现函数自执行
mounted : 在这发起后端请求,拿回数据,配合路由钩子做一些事情
beforeDestory: 你确认删除XX吗? destoryed :当前组件已被删除,清空相关内容
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