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 v-color="color">Hello ！</div>
<button @click="changeColor">切换颜色</button>
</div>
</body>
<script src="https://unpkg.com/vue/dist/vue.js"></script>
<script type="text/javascript">
Vue.directive('color', {
bind: function (el, binding, vnode) {
el.style.color = binding.value
},
update(el, binding) {
el.style.color = binding.value
}
})
var vm = new Vue({
el: '#app',
data() {
return {
color: 'red'
}
},
methods: {
changeColor() {
this.color = '#' + Math.floor( Math.random() * 0xffffff ).toString(16);
}
}
})
</script>
</html>
运行结果