<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>className</title>
<style>
* {
margin: 0;
padding: 0;
}
ul {
width: 400px;
height: 400px;
border: 1px solid #999;
}
ul li {
list-style: none;
width: 80px;
height: 40px;
line-height: 40px;
text-align: center;
border: 1px solid #999;
margin: 10px;
float: left;
}
span {
padding-left: 6px;
}
</style>
<script>
window.onload = function() {
var ul = document.getElementsByTagName("ul")[0];
var btns = document.getElementsByTagName("button");
for (var i = 0; i < btns.length; i++) {
btns[i].onclick = function() {
var hasLi = false;
var nli = document.createElement("li");
nli.innerHTML = this.innerHTML + "<span>✖</span>";
var type = this.getAttribute("data-type");
console.log(type);
nli.setAttribute("data-type", type);
var ali = ul.getElementsByTagName("li");
for (var i = 0; i < ali.length; i++) {
if (ali[i].getAttribute("data-type") == this.getAttribute("data-type")) {
hasLi = true;
break;
} else {
hasLi = false;
}
}
if (hasLi == false) {
ul.append(nli);
var span = nli.getElementsByTagName("span")[0];
span.onclick = function() {
ul.removeChild(this.parentNode);
}
}
}
}
}
</script>
</head>
<body>
<ul>
</ul>
<div>
<button data-type="yw">语文</button>
<button data-type="sx">数学</button>
<button data-type="yy">英语</button>
<button data-type="zz">政治</button>
<button data-type="ls">历史</button>
<button data-type="dl">地理</button>
<button data-type="ty">体育</button>
</div>
</body>
</html>
转自转自 https://blog.csdn.net/jiagezuishuai/article/details/77862307
