组件：子传父 对话框
把子组件中的数据传递到父组件中
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>子给父传值</title>
</head>
<body>
<div class="itany">
<father></father>
</div>
<script src="./vue.js"></script>
<script>
Vue.component('father', {
template: `
<div>
<h1>{{num2}}</h1> <child @meth='the'></child>
</div> `,
data: function() {
return {
num2: ''
}
},
methods: {
the: function(txt) {
this.num2 = txt
}
}
})
Vue.component('child', {
template: ` <button @click="show">传给父元素</button> `,
data: function() {
return {
num: '我是子组件，我要传值给父组件'
}
},
methods: {
show: function() {
this.$emit('meth', this.num)
}
}
})
new Vue({
el: '.itany'
})
</script>
</body>
</html>
注释：可以把子组件中input的value传递到父组件的p标签中去
练习2：制作一个聊天对话框
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>对话框</title>
</head>
<body>
<div class="itany">
<father></father>
</div>
<script src="vue.js"></script>
<script>
Vue.component('father', {
template: `
<div>
<ul> <li v-for="(value,index) in one">{{value}}</li>
</ul> <child @show="the" userName='jack'></child>
<child @show="the" userName='roce'></child>
</div> `,
data: function() {
return {
one: []
}
},
methods: {
the: function(txt) {
this.one.push(txt)
}
}
})
Vue.component('child', {
props: ['userName'],
template: `
<div> <label>{{userName}}</label> <input type="text" v-model="arr"> <button @click="add">发送</button>
</div> `,
data: function() {
return {
arr: ''
}
},
methods: {
add: function() {
this.$emit('show', this.userName + ':' + this.arr);
this.arr = ""
}
}
})
new Vue({
el: ".itany"
})
</script>
</body>
</html>
点击按钮时，就会弹出父组件传给子组件的数据
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>子给父传值练习</title>
</head>
<body>
<div class="itany">
<father></father>
</div>
<script src="vue.js"></script>
<script>
Vue.component('father', {
template: `
<div> <h1>我是父元素</h1> <p>请传值<b>{{mess}}</b></p> <child @show="the"></child>
</div> `,
data: function() {
return {
mess: ""
}
},
methods: {
the: function(txt) {
this.mess = txt
}
}
})
Vue.component('child', {
template: `
<div>
<h1>我是子元素</h1> <input type="text" v-model="arr"> <button @click="add">传值</button>
</div> `,
data: function() {
return {
arr: ""
}
},
methods: {
add: function() {
this.$emit('show', this.arr)
}
}
})
new Vue({
el: '.itany'
})
</script>
</body>
</html>
