<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>
<body>
<div id="app">
<my></my>
</div>
<script src="js/vue.js"></script>
<script>
Vue.component('my',{
template:`
<div>
<p>总：{{counter1}}</p>
<my1 @increase="lan" @reduce="lan"></my1>
</div>
`,
data:function(){
return{
counter1:0
}
},
methods:{
lan:function(txt){
this.counter1=txt
}
}
})
Vue.component('my1',{
template:`
<div>
<button @click="wang">+1</button>
<button @click="nuo">-1</button>
</div>
`,
data:function(){
return{
counter:0
}
},
methods:{
wang:function(){
this.counter++;
this.$emit('increase',this.counter)
},
nuo:function(){
this.counter--;
this.$emit('reduce',this.counter)
}
}
})
new Vue({
el:'#app'
})
</script>
</body>
</html>
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