console 命令行工具 X clear
console
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Vue 测试实例 - 菜鸟教程(runoob.com)</title>
<script src="https://cdn.staticfile.org/vue/2.2.2/vue.min.js"></script>
</head>
<body>
<div id="app">
    <div v-if="Math.random()>0.5">
        Sorry
    </div>
    <div v-else>
        Not Sorry
    </div>
</div>
<script>
    new Vue({
        el:'#app'
    })
</script>
</body>
</html>