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正反选.html
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<!DOCTYPE html>
<html>
<head>
<meta charset='utf-8'/>
<title>JS正反选</title>
</head>
<body>
<h3>JavaScript：全选和反选、全不选</h3>
<ul id="uid">
<li><input type="checkbox" name="likes" value="1"/>最强王者</li>
<li><input type="checkbox" name="likes" value="2"/>大师</li>
<li><input type="checkbox" name="likes" value="3"/>钻石</li>
<li><input type="checkbox" name="likes" value="4"/>白金</li>
<li><input type="checkbox" name="likes" value="5"/>黄金</li>
<li><input type="checkbox" name="likes" value="6"/>白银</li>
<li><input type="checkbox" name="likes" value="7"/>青铜</li>
<li><input type="checkbox" name="likes" value="8"/>未满30</li>
</ul>
<li><input type="checkbox" name="likes" value="8"/>黄铜渣渣</li>
<button onclick="doCheck(1)">全选</button>
<button onclick="doCheck(2)">全不选</button>
<button onclick="doCheck(3)">反选</button>
<script type="text/javascript">
function doCheck(b){
//获取所有的input选择框
var uid = document.getElementById("uid");
var list = uid.getElementsByTagName("input");
//遍历
for(var i=0;i<list.length;i++){
switch(b){
case 1: list[i].checked = true; break;
case 2: list[i].checked = false; break;
case 3: list[i].checked = !list[i].checked; break;
}
}
}
</script>
</body>
</html>