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5demo.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>vue 5demo</title>
<script src="./js/vue.js"></script>
</head>
<body>
<div id="app">
<my-header :list="list"></my-header>
<!-- 调试组件默认值，记得 不要绑定 :list -->
<my-header></my-header>
</div>
<script>
var vm3 = new Vue({
el: "#app",
data: {
message:"hello my-header",
list: ["第一项", "第二项", "第三项"]
},
components: {
"my-header": {
template: `<div>
<h2 ref="myTitle" >标题 {{ nowMessage }} </h2>
<ul>
<li v-for="item in list">{{ item }}</li>
</ul>
<my-nav @changeEvents="getChildContent" :list="list"></my-nav>
</div>`,
data: function () {
return {
nowMessage: "hello myHeader!!!",
// list: ["第一项", "第二项", "第三项"]
}
},
// 父组件向子组件进行通信操作 props
// props: [
// 'list'
// ],
props: {
'list': {
type: Array,
default: function() {
// 需要函数
return ["第一项1", "第二项2", "第三项3"]
}
}
},
methods: {
getChildContent: function(str) {
console.log(str)
this.nowMessage = str; // 数据操作，尽量选用这种
this.$refs.myTitle.innerHTML = str // DOM 操作，非常特殊的情况下使用，数据较难修改的时候
}
},
components: {
"my-nav": {
template: `<ul>
<li @click="getContent" v-for="item in list">{{ item }}</li>
</ul>`,
props: [
"list"
],
methods: {
getContent: function(ev) {
// console.log(this)
// console.log(ev.target.innerHTML)
this.$emit("changeEvents", ev.target.innerHTML)
}
},
}
}
}
}
})
</script>
</body>
</html>