我在自学Vue.js.我使用v-bind将highlight类添加到span元素中，它应该向元素中添加newBorder样式，但没有应用该样式.
<!DOCTYPE HTML>
<html>
<head>
<title>Intro to v-bind</title>
<meta charset="UTF-8">
<script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.js"></script>
<style>
.container {
background: #cecece;
}
.newBorder {
border: 5px solid yellow;
}
</style>
</head>
<body>
<div id="app">
<img v-bind:src="'assets/images/look.jpg'" v-bind:alt="'illustration of the word -Look-'" v-bind:title="'Look'">
<span v-bind:class="{loadClass,highlight}">
look at me!
</span>
</div>
<script>
var app = new Vue({
el: '#app',
data: {
loadClass: 'container',
highlight: 'newBorder'
}
});
</script>
</body>
</html>
如果你能指出我的错误，我将不胜感激.