Vue 插值和表達式
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Vue</title>
</head>
<body>
<div id="app">
{{date}}
</div>
<script src="https://unpkg.com/vue/dist/vue.min.js"></script>
<script>
var app =new Vue({
el : '#app',
data: {
date: new Date ()
},
mounted: function () {
var _this = this; //聲明一個變量指向Vue實例this，保證作用域一致
this.timer= setInterval(function() {
_this.date= new Date(); //修改數據 date
} ,1000);
},
beforeDestroy: function(){
if (this. timer) {
clearInterval(this.timer); //:在Vue實例銷燬前，清除我們的定時器
}
}
})
</script>
</body>
</html>