JavaScript实现全选，全不选等效果。。。
<!DOCTYPE html>
<html>
<head>
<title>JavaScript全选练习</title>
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<script type="text/javascript" >
function chooseAll()//全选
{
var a=document.getElementsByName("box");
for(var i=0;i<a.length;i++)
{
a[i].checked=true;
}
}
function chooseNo()//全不选
{
var a=document.getElementsByName("box");
for(var i=0;i<a.length;i++)
{
a[i].checked=false;
}
}
function chooseRe()//反选
{
var a=document.getElementsByName("box");
for(var i=0;i<a.length;i++)
{
if(a[i].checked==false) a[i].checked=true;
else a[i].checked=false;
}
}
function chooseAllNo()//全选、全不选
{
var a=document.getElementsByName("box");
var b=document.getElementById("abox");
if(b.checked==true)
{
for(var i=0;i<a.length;i++)
{
a[i].checked=true;
}
}
else
{
for(var i=0;i<a.length;i++)
{
a[i].checked=false;
}
}
}
</script>
</head>
<body>
<input type="checkbox" id="abox" onclick="chooseAllNo();">全选/全不选<br>
<input type="checkbox" name="box">张三<br>
<input type="checkbox" name="box">李四<br>
<input type="checkbox" name="box">王五<br>
<input type="checkbox" name="box">赵六<br>
<input type="button" value="全选" onclick="chooseAll();"/>
<input type="button" value="全不选" onclick="chooseNo();"/>
<input type="button" value="反选" onclick="chooseRe();"/>
</body>
</html>
运行示意：
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