<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<!-- <script src="vue.js"></script> -->
<script src="https://unpkg.com/vue/dist/vue.js"></script>
</head>
<body>
<div id="app">
<ul>
<li :style="{color:colors[i]}" v-for="(item,i) in list" @click="show(item,i)">选项{{item}}</li>
</ul>
</div>
<script>
var vm = new Vue({
el: ‘#app‘,
data: {
list: [1, 2, 3, 4, 5],
colors: [‘balck‘, ‘green‘, ‘yellow‘, ‘purple‘, ‘blue‘]
},
methods: {
show: function (item, i) {
this.$set(this.colors, i, ‘red‘)
}
}
})
</script>
</body>
</html>
原文：https://www.cnblogs.com/qinlongqiang/p/12342298.html