速记：粗浅的理解是，事件的结果是影响单个组件还是多个组件。因为大部分组件是要共享的，但他们的data是私有的，所以每个组件都要return一个新的data对象
返回对象的时候
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<title></title>
<link rel="stylesheet" href="">
<script src="https://cdn.staticfile.org/vue/2.2.2/vue.min.js"></script>
</head>
<body>
<div id="components-demo3" class="demo">
<button-counter2></button-counter2>
<button-counter2></button-counter2>
<button-counter2></button-counter2>
</div>
<script>
Vue.component('button-counter2',{
data:function(){
return {
count:0
}
},
template:'<button v-on:click="count++">点击了{{count}}次</button>'
})
new Vue({
el:'#components-demo3'
})
</script>
</body>
</html>
data直接返回值的时候
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<title></title>
<link rel="stylesheet" href="">
<script src="https://cdn.staticfile.org/vue/2.2.2/vue.min.js"></script>
</head>
<body>
<div id="components-demo3" class="demo">
<button-counter2></button-counter2>
<button-counter2></button-counter2>
<button-counter2></button-counter2>
</div>
<script>
buttonCounter2Data={
count:0
}
Vue.component('button-counter2',{
data:function(){
return buttonCounter2Data
},
template:'<button v-on:click="count++">点击了{{count}}次</button>'
})
new Vue({
el:'#components-demo3'
})
</script>
</body>
</html>
