var app2 = new Vue({
el: '#app-2',
data: {
message: 'You loaded this page on ' + new Date()
}
})
<script src="https://unpkg.com/vue/dist/vue.js">
</script>
<body>
<div id="app-2">
<span v-bind:title="message">
<!-- 元素span的title属性被message所替换啦
v-bind属性被称为指令-->
Hover your mouse over me for a few seconds to see my dynamically bound title!
</span>
</div>
</body>