点评：全选/取消全选在批量操作数据时经常会使用到，下文有个不错的示例使用js完成全选/取消全选操作，感兴趣的朋友可以参考下
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>无标题文档</title>
<script type="text/javascript" language="javascript">
function selectAllDels()
{
var allCheckBoxs = document.getElementsByName("preDelCheck");
var desc = document.getElementById("allChecked");
var selectOrUnselect=false;
for(var i = 0; i < allCheckBoxs.length; i ++ )
{
if(allCheckBoxs[i].checked){
selectOrUnselect=true;
break;
}
}
if (selectOrUnselect)
{
_allUnchecked(allCheckBoxs);
}else
{
_allchecked(allCheckBoxs);
}
}
function _allchecked(allCheckBoxs){
for(var i = 0; i < allCheckBoxs.length; i ++ )
{
allCheckBoxs[i].checked = true;
}
}
function _allUnchecked(allCheckBoxs){
for(var i = 0; i < allCheckBoxs.length; i ++ )
{
allCheckBoxs[i].checked = false;
}
}
</script>
</head>
<body>
<p>test</p>
<form>
<input type="checkbox" name="preDelCheck" value="cream">ID1
<input type="checkbox" name="preDelCheck" value="sugar" >ID2
<input type="checkbox" name="preDelCheck" value="sugar">ID3
<input type="checkbox" name="preDelCheck" value="sugar">ID4
<input type="checkbox" name="preDelCheck" value="sugar">ID5
<input type="button" id="allChecked" value="全选/取消全选" onClick="selectAllDels()">
</form>
</body>
</html>
