Vue生命周期函数是vue实例在某一时间点会自动执行的函数
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<!DOCTYPE html>
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<html>
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<head>
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<title></title>
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<script type="text/javascript" src="https://cdn.jsdelivr.net/vue/2.1.3/vue.js"></script>
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</head>
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<body>
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<div id="app">
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<p>{{ message }}</p>
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</div>
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<script type="text/javascript">
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var app = new Vue({
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el: '#app',
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data: {
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message : "xuxiao is boy"
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},
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beforeCreate: function () {
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console.group('beforeCreate 创建前状态===============》');
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console.log("%c%s", "color:red" , "el : " + this.$el); //undefined
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console.log("%c%s", "color:red","data : " + this.$data); //undefined
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console.log("%c%s", "color:red","message: " + this.message)
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},
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created: function () {
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console.group('created 创建完毕状态===============》');
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console.log("%c%s", "color:red","el : " + this.$el); //undefined
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console.log("%c%s", "color:red","data : " + this.$data); //已被初始化
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console.log("%c%s", "color:red","message: " + this.message); //已被初始化
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},
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beforeMount: function () {
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console.group('beforeMount 挂载前状态===============》');
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console.log("%c%s", "color:red","el : " + (this.$el)); //已被初始化
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console.log(this.$el);
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console.log("%c%s", "color:red","data : " + this.$data); //已被初始化
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console.log("%c%s", "color:red","message: " + this.message); //已被初始化
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},
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mounted: function () {
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console.group('mounted 挂载结束状态===============》');
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console.log("%c%s", "color:red","el : " + this.$el); //已被初始化
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console.log(this.$el);
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console.log("%c%s", "color:red","data : " + this.$data); //已被初始化
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console.log("%c%s", "color:red","message: " + this.message); //已被初始化
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},
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beforeUpdate: function () {
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console.group('beforeUpdate 更新前状态===============》');
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console.log("%c%s", "color:red","el : " + this.$el);
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console.log(this.$el);
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console.log("%c%s", "color:red","data : " + this.$data);
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console.log("%c%s", "color:red","message: " + this.message);
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},
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updated: function () {
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console.group('updated 更新完成状态===============》');
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console.log("%c%s", "color:red","el : " + this.$el);
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console.log(this.$el);
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console.log("%c%s", "color:red","data : " + this.$data);
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console.log("%c%s", "color:red","message: " + this.message);
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},
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beforeDestroy: function () {
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console.group('beforeDestroy 销毁前状态===============》');
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console.log("%c%s", "color:red","el : " + this.$el);
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console.log(this.$el);
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console.log("%c%s", "color:red","data : " + this.$data);
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console.log("%c%s", "color:red","message: " + this.message);
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},
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destroyed: function () {
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console.group('destroyed 销毁完成状态===============》');
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console.log("%c%s", "color:red","el : " + this.$el);
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console.log(this.$el);
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console.log("%c%s", "color:red","data : " + this.$data);
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console.log("%c%s", "color:red","message: " + this.message)
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}
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})
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</script>
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</body>
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</html>
beforecreated：el 和 data 并未初始化
created:完成了 data 数据的初始化，el没有
beforeMount：完成了 el 和 data 初始化
mounted ：完成挂载