<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
</head>
<body>
<main id="app">
<app-header v-if="headerIsShow"></app-header>
<button @click="changeHeader">显示隐藏header</button>
</main>
<script src="vue.js"></script>
<script>
Vue.component('app-header', {
template: `<header>{{ tit }}</header>`,
data: function() {
return {
tit: '标题',
timer: null
};
},
// 数据可以使用了
created: function() {
this.timer = setInterval(function() {
console.log('你好!');
}, 1000);
},
// 组件销毁前执行
beforeDestroy: function() {
console.log('beforeDestory');
console.log(document.querySelector('header'));
},
// !!重点!!
// 组件销毁后执行, 同时数据绑定也失效了
destroyed: function() {
clearInterval(this.timer);
console.log('destoryed');
console.log(document.querySelector('header'));
}
});
var vm = new Vue({
el: '#app',
data: {
headerIsShow: true
},
methods: {
changeHeader: function() {
this.headerIsShow = !this.headerIsShow;
}
}
});
</script>
</body>
</html>
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