vue快速入门（十二）v-key索引标志

注释很详细，直接上代码

新增内容

v-key的使用场景
数组筛选器的使用

源码

<!DOCTYPE html>
<html lang="en">
<head><meta charset="UTF-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><title>Document</title><style>*{margin: 0;padding: 0;}#all{margin: 100px auto;padding-bottom: 10px;width: 300px;height: auto;background: linear-gradient(rgba(4, 226, 242, 0.5),rgba(3, 255, 117, 0.5));border-radius: 20px;box-shadow: 15px 15px 30px rgba(0,0,0,0.5);}#title{text-align: center;font-size: 27px;font-family: 楷体;font-weight: 800;padding-top:20px;}#all ul{list-style: none;margin: 0px 30px 10px 30px;}#all ul li{margin: 30px 0;height: 35px;line-height: 35px;padding: 0 25px;}#all ul div{display: inline-block;}#start{width: 110px;}li{background-color: #ffffff77;border-radius: 10px;backdrop-filter: blur(5px);}button{/* 鼠标样式 */cursor: pointer;border-radius: 5px;border: none;/* 其实没啥很明显的效果，单纯是不知道写啥好了 */box-shadow: 5px 5px 20px rgba(13, 239, 198, 0.5);background-color: rgba(0,0,0,0);}</style>
</head>
<body><!-- 挂载点 --><div id="root"><div id="all"><div id="title">收复失地</div><ul><!-- 重点就是这个v-key索引，简写:key 我们会设为自己的id--><li v-for="(item,index) in areas" :key="item.id"><span>{{item.name}}</span><div id="start"><span v-for="(item_1,index_1) in item.difficulty">⭐</span></div><button @click="dis(item.id)">征讨</button></li></ul></div></div><!-- 导入vue的js代码 --><script src="./lib/vue2.js"></script><script>const app = new Vue({// Vue实例el: '#root',// 挂载点data: {// 数据areas:[{id:1,name:'蒙德',difficulty:1},{id:2,name:'璃月',difficulty:2},{id:3,name:'稻妻',difficulty:3},{id:4,name:'须弥',difficulty:4},{id:5,name:'枫丹',difficulty:5}]},methods: {// 方法dis(id){// filter: 根据条件，保留满足条件的对应项，得到一个新数组this.areas=this.areas.filter(item=>item.id!=id)}}})</script>
</body>
</html>