vue.js中created()activated()deactivated()理解
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created():在创建vue对象时,当html渲染之前触发;但是注意,全局vue.js不强制刷新或者重启时只创建一次,也就是说,created()只会触发一次;
activated():在vue对象存活的情况下,进入当前存在activated()函数的页面时,一进入页面就触发;可用于初始化页面数据、keepalive缓存组件后,可执行方法;
deactivated():离开组件时执行;
注意:activated()和deactivated()只有在<keep-alive></keep-alive>包裹的时候才有效;
例:
新建两个组件,compA,compB:
<template> <div class="app"> 我是组件A </div> </template> <script> export default{ name: "compA", data(){ return { } }, created(){ console.log(\'created\'); }, activated(){ console.log(\'activated\'); }, deactivated(){ console.log(\'deactivated\'); } } </script> 同理建compB; 在view中引用两个组件: <template> <div class="app"> <div class="bth"> <button @click="currentComponent=\'compA\'">A</button> <button @click="currentComponent=\'compB\'">B</button> </div> </div> <keep-alive> <component :is="currentComponent"></component> </keep-alive> </template> <script> import compA from \'./component/compA\' import compB from \'./component/compB\' export default{ name: "App", component: { compA, compB }, data(){ return { currentComponent: \'compA\' } } } </script>
在点击切换B组件时,A组件的deactivated()会执行;
注::is后绑定组件名,渲染当前组件;
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