var app2 = new Vue({
el: '#app-2',
data: {
message: '页面加载于 ' + new Date()
}
})
<script src="https://unpkg.com/vue/dist/vue.js"></script>
<div id="app-2">
<span v-bind:title="message">
鼠标悬停几秒钟查看此处动态绑定的提示信息！
</span>
</div>