<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>总结生命周期</title>
<script type="text/javascript" src="../vue.js"></script>
</head>
<body>
<div id="root">
<h2 v-if="isShowHello">你好</h2>
<h2 :style="{opacity}">欢迎学习Vue</h2>
<button @click="opacity = 1">透明度设置为1</button>
<button @click="stop">停止变换</button>
</div>
<script type="text/javascript">
Vue.config.productionTip = false // 组织开发环境提示
// 创建Vue实例
const vm = new Vue({
el: '#root',
data: {
isShowHello: true,
opacity: 1
},
methods: {
stop() {
this.$destroy()
}
},
// Vue完成模板解析，并把真实的DOM放入页面后调用mounted注意这里是方法函数，不是对象，刷新页面不会调用mounted
mounted() {
console.log('mounted')
this.timer = setInterval(() => {
console.log("setInterval")
this.opacity -= 0.01
if (this.opacity <= 0) this.opacity = 1
}, 16)
},
beforeDestroy() {
console.log("beforeDestroy-清除定时器")
clearInterval(this.timer)
}
})
// setInterval(()=>{
// vm.opacity -= 0.01
// if (vm.opacity <= 0) vm.opacity = 1
// },16)
</script>
</body>
</html>