'text-danger': this.error && this.error.type === 'fatal',
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Vue 测试实例 - W3xue教程(w3xue.com)</title>
<script src="//unpkg.com/vue/dist/vue.js"></script>
<style>
.active {
width: 100px;
height: 100px;
background: green;
}
.text-danger {
background: red;
</style>
</head>
<body>
<div id="app">
<div v-bind:class="classObject"></div>
</div>
<script>
new Vue({