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52 lines
1.4 KiB
52 lines
1.4 KiB
2 years ago
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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="UTF-8">
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<title>总结生命周期</title>
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<script type="text/javascript" src="../vue.js"></script>
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</head>
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<body>
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<div id="root">
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<h2 v-if="isShowHello">你好</h2>
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<h2 :style="{opacity}">欢迎学习Vue</h2>
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<button @click="opacity = 1">透明度设置为1</button>
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<button @click="stop">停止变换</button>
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</div>
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<script type="text/javascript">
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Vue.config.productionTip = false // 组织开发环境提示
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// 创建Vue实例
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const vm = new Vue({
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el: '#root',
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data: {
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isShowHello: true,
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opacity: 1
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},
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methods: {
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stop() {
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this.$destroy()
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}
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},
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// 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
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mounted() {
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console.log('mounted')
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this.timer = setInterval(() => {
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console.log("setInterval")
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this.opacity -= 0.01
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if (this.opacity <= 0) this.opacity = 1
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}, 16)
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},
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beforeDestroy() {
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console.log("beforeDestroy-清除定时器")
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clearInterval(this.timer)
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}
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})
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// setInterval(()=>{
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// vm.opacity -= 0.01
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// if (vm.opacity <= 0) vm.opacity = 1
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// },16)
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</script>
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</body>
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</html>
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