function chkAll(treeID)
{
//debugger;
var chkall= document.getElementById("chkall");
var chkother= document.getElementsByTagName("input");
for (var i=0;i<chkother.length;i++)
{
if( chkother[i].type=='checkbox')
{
if(chkother[i].id.indexOf(treeID)>-1)
{
if(chkall.checked==true)
{
chkother[i].checked=chkall.checked;
}
}
}
}
}
2、添加一个全选按钮
<input >红色地方为关键地方