vue 生命周期的钩子函数

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport"
content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
</head>
<body>
<div id="app">
<App></App>
</div>

<script src="https://mirrors.idiyrom.com/web/js/vue.mini.js"></script>
<script>

let App2 = {
data() {
return {
msg: "ropon",
count: 0,
timer: null
}
},
template: `
<div id="app2">
<div id="box">{{ msg }}</div>
<p>{{ count }}</p>
<button @click="change">修改</button>
</div>`,
methods: {
change() {
this.msg = "pengge";
document.querySelector("#box").style.color = "red";
}
},
//生命周期的钩子函数
//组件创建之前
beforeCreate() {
console.log("组件创建之前", this.msg);
},
//组件创建之后
created() {
//每隔1s count加1
// this.timer = setInterval(() => {
// this.count++;
// }, 1000);
console.log("组件创建之后", this.msg);
},
//装载数据到DOM之前调用
beforeMount() {
console.log(document.getElementById("app"));
},
//装载数据到DOM之后调用
mounted() {
console.log(document.getElementById("app"));
},
//更新之前调用此钩子,获取原始的DOM
beforeUpdate() {
console.log("更新之前原始DOM", document.getElementById("app").innerHTML);
},
//更新之后调用此钩子,获取最新的DOM
updated() {
console.log("更新之后最新DOM", document.getElementById("app").innerHTML);
},
beforeDestroy() {
console.log("beforeDestroy");
},
//销毁时调用,注意定时器销毁需要在此方法中处理
destroyed() {
console.log("destroyed", this.timer);
clearInterval(this.timer);
},
activated() {
console.log("组件被激活");
},
deactivated() {
console.log("组件被停用");
}
};

let App = {
data() {
return {
isShow: true
}
},
template: `
<div>
<h3>测试生命周期钩子函数</h3>
<keep-alive>
<App2 v-if="isShow"></App2>
</keep-alive>
<button @click="handlerClick">改变App2组件的生死</button>
</div>
`,
methods: {
handlerClick() {
this.isShow = !this.isShow;
}
},
components: {
App2
}
};

let vm = new Vue({
el: "#app",
data() {
return {

}
},
components: {
App
}
});
</script>
</body>
</html>