代码
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
</head>
<body>
<div id="app">
<div class="defaultClass" v-bind:class="classObject">Hello !</div>
</div>
</body>
<script src="https://unpkg.com/vue/dist/vue.js"></script>
<script>
var vm = new Vue({
el: '#app',
data: {
classObject: {
show: true,
'text-danger': false
}
},
})
</script>
</html>
运行结果