原生JS实现列表项删除功能：面向对象与事件委托详解

<!DOCTYPE html>
<html>
<head>
 <meta charset="utf-8">
 <!--code here-->
 <title>demo</title>
 <style>
  * {
   padding: 0;
   margin: 0;
  }

  .head, li div {
   display: inline-block;
   width: 70px;
   text-align: center;
  }

  li .id, li .sex, .id, .sex {
   width: 15px;
  }

  li .name, .name {
   width: 40px;
  }

  li .tel, .tel {
   width: 90px;
  }

  li .del, .del {
   width: 15px;
  }

  ul {
   list-style: none;
  }

  .user-delete {
   cursor: pointer;
  }

 </style>
</head>

<body>
<div id="J_container">
 <div class="record-head">
  <div class="head id">序号</div>
  <div class="head name">姓名</div>
  <div class="head sex">性别</div>
  <div class="head tel">电话号码</div>
  <div class="head province">省份</div>
  <div class="head">操作</div>
 </div>
 <ul id="J_List">
  <li>
   <div class="id">1</div>
   <div class="name">张三</div>
   <div class="sex">男</div>
   <div class="tel">13788888888</div>
   <div class="province">浙江</div>
   <div class="user-delete">删除</div>
  </li>
  <li>
   <div class="id">2</div>
   <div class="name">李四</div>
   <div class="sex">女</div>
   <div class="tel">13788887777</div>
   <div class="province">四川</div>
   <div class="user-delete">删除</div>
  </li>
  <li>
   <div class="id">3</div>
   <div class="name">王二</div>
   <div class="sex">男</div>
   <div class="tel">13788889999</div>
   <div class="province">广东</div>
   <div class="user-delete">删除</div>
  </li>
 </ul>
</div>

<script>
 // 此处也可换成ES6的写法
 function Contact() {
  this.init();
 }

 // your code here
</script>
</body>
</html>

<meta name="viewport" content="width = device-width,initial-scale=1">

Contact.prototype.init = function () {
  console.log("Test");
  var div = document.getElementsByClassName("user-delete");
  var ul = document.querySelector("#J_List");
  var list = ul.querySelectorAll("li");

  for (var i = 0; i < div.length; i++) {
   (function (i) {
    div[i].onclick = function () {
     list[i].remove();
     console.log(i);
    }
   })(i);
  }
 }

new Contact();