示例代码：全选、全不选、反选
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html;charset=utf-8">
<title>Javascript测试</title>
<script type="text/javascript">
onload=function(){
document.getElementById(‘btnSelectAll‘).onclick=function(){
var inputObjs = document.getElementsByTagName("input");
for(var i=0;i<inputObjs.length;i++)
{
if(inputObjs[i].type=="checkbox")
{
inputObjs[i].checked = true;
}
}
};
document.getElementById(‘btnSelectNone‘).onclick=function(){
var inputObjs = document.getElementsByTagName("input");
for(var i=0;i<inputObjs.length;i++)
{
if(inputObjs[i].type=="checkbox")
{
inputObjs[i].checked = false;
}
}
};
document.getElementById(‘btnSelectReverse‘).onclick=function(){
var inputObjs = document.getElementsByTagName("input");
for(var i=0;i<inputObjs.length;i++)
{
if(inputObjs[i].type=="checkbox")
{
inputObjs[i].checked = !inputObjs[i].checked;
}
}
};
};
</script>
</head>
<body>
<input type="button" id="btnSelectAll" value="全选"/>
<input type="button" id="btnSelectNone" value="全不选"/>
<input type="button" id="btnSelectReverse" value="反选"/>
<input type="checkbox" value="1"/>吃饭
<input type="checkbox" value="2"/>睡觉
<input type="checkbox" value="3"/>跑步
<input type="checkbox" value="4"/>读书
<input type="checkbox" value="5"/>看电影
</body>
</html>效果图
原文：http://lsieun.blog.51cto.com/9210464/1844868