以下代码直接运行，看console，就秒懂，别的就不BB了
<!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>Vue.js-lifecycle</title>
<script src="../vue.js"></script>
<script src="https://cdn.jsdelivr.net/npm/vue"></script>
</head>
<body>
<div id="root">
<div>{{ greeting }}</div>
</div>
<script>
Vue.config.productionTip = false
const vm = new Vue({
el: '#root',
data: {
greeting: 'hello'
},
// 初始化时期
beforeCreate () {
console.log(this.$el)
console.log(this.greeting)
},
created () {
console.log(this.$el)
console.log(this.greeting)
},
// 创建时期
beforeMount () {
console.log(this.$el.innerHTML)
console.log(this.greeting)
},
mounted () {
console.log(this.$el.innerHTML)
console.log(this.greeting)
},
// 生存期
beforeUpdate () {
console.log('beforeUpdate:' + this.greeting)
},
updated () {
console.log('updated:' + this.greeting)
},
// 销毁期
beforeDestroy () {
console.log('beforeDestroy:' + this.greeting)
},
destroyed () {
console.log('destroyed:' + this.greeting)
}
})
</script>
</body>
</html>
------------------------------------
undefined
undefined
undefined
hello
<div>{{ greeting }}</div>
hello
<div>hello</div>
hello
记得结合这张图！
z.png
如果再不懂就放弃吧！！！
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