组件之间传值之子给父传（事件）自定义事件 $emit
2018-09-21 本文已影响0人
天赐很棒
子给父传实例1：
body部分：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
</head>
<body>
<div id='add'>
<my-father></my-father>
</div>
js部分：
<script src='js/vue.js'></script>
<script>
Vue.component("my-father",{
template:<div> <h1>{{mess}}</h1> <my-child @send='rcvMsg'></my-child> </div>,
data:function(){
return{
mess:''
}
},
methods:{
rcvMsg:function(txt){
this.mess=txt
}
}
})
Vue.component('my-child',{
template:`
<button @click='sendToFather'>传给父元素</button>
`,
data:function(){
return{
msg:'我是子组件中的数据，要给父组件传值'
}
},
methods:{
sendToFather:function(){
// this.emit('send',this.msg)
}
}
})
new Vue({
el:"#add"
})
</script>
</body>
</html>
4.png
子给父传小练习：
body部分：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
</head>
<body>
<div id="app">
<my-father></my-father>
</div>
js部分：
<script src="js/vue.js"></script>
<script>
Vue.component('my-father',{
template:
<div> <h1>我是父组件</h1> <p>组件传过来的数据:<b>{{mess}}</b></p> <my-child @send='rcvMsg'></my-child> </div>,data:function(){
return{
mess:''
}
},
methods:{
rcvMsg:function(txt){
this.mess=txt
}
}
})
Vue.component('my-child',{
template:`
<div>
<h1>我是子组件</h1>
<input type="text" v-model='msg'> <button @click='sendMsg'>发送</button>
</div>
`,
data:function(){
return{
msg:''
}
},
methods:{
sendMsg:function(){
this.$emit('send',this.msg)
}
}
})
new Vue({
el:'#app'
})
</script>
</body>
</html>
5.png
组件购物车实例：
body部分：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
<link rel="stylesheet" href="css/bootstrap.css">
</head>
<body>
<div id='app'>
<my-father></my-father>
</div>
js部分：
<script src='js/vue.js'></script>
<script>
Vue.component('my-father',{
template:
<div class='container'> <table class='table table-bordered text-center'> <thead> <tr> <th class='text-center'>编号</th> <th class='text-center'>名称</th> <th class='text-center'>单价</th> <th class='text-center'>数量</th> <th class='text-center'>小计</th> </tr> </thead> <my-child v-bind:fruit='list'></my-child> </table> </div>,data:function(){
return{
list:[
{pname:'apple',price:1,count:1,sub:1},
{pname:'pear',price:1,count:1,sub:1},
{pname:'orange',price:1,count:1,sub:1}
]
}
}
})
Vue.component("my-child",{
props:['fruit'],
template:`
<tbody>
<tr v-for="(value,index) in fruit">
<td>{{index+1}}</td>
<td>{{value.pname}}</td>
<td>{{value.price}}</td>
<td>
<button @click='add(index)'>+</button>
<span>{{value.count}}</span>
<button @click="redu(index)">-</button>
</td>
<td>{{value.sub}}</td>
</tr>
<tr>
<td colspan=5>总价:{{sum}}</td>
</tr>
</tbody>
`,
data:function(){
return{
sum:0
}
},
methods:{
add:function(ind){
this.fruit[ind].count++;
this.fruit[ind].sub=this.fruit[ind].count*this.fruit[ind].price;
this.countSum();
},
redu:function(ind){
if(this.fruit[ind].count>1){
this.fruit[ind].count--;
}
this.fruit[ind].sub=this.fruit[ind].count*this.fruit[ind].price;
this.countSum();
},
countSum:function(){
for(var i=0,total=0;i<this.fruit.length;i++){
total+=this.fruit[i].sub;
}
this.sum=total;
}
}
})
new Vue({
el:'#app'
})
</script>
</body>
</html>
6.png
