gridview中checkbox全选的两中方法

后台方法
  //protected void chkAll_CheckedChanged(object sender, EventArgs e)
        //{
        //    for (int i = 0; i < this.grid.Rows.Count; i++)
        //    {
        //        ((CheckBox)grid.Rows[i].FindControl("chkItem")).Checked = ((CheckBox)this.grid.HeaderRow.FindControl("chkAll")).Checked;
        //    }
        //}


脚本方法
function selectAll(opt)
{
    var chkArray = window.document.getElementsByTagName("input");
    var isCheck = opt.checked;
   
    for(var i = 0; i< chkArray.length; i++)
    {
        if(chkArray[i].type != "checkbox")
        {
            continue;
        }
        if(opt != chkArray[i])
        {
            chkArray[i].checked = isCheck;
        }
    }
}