asp.net中的postback方法

<input type="hidden" value="0" id="__EVENTTARGET" name="__EVENTTARGET" runat="server"/>

<input type="hidden" value="0" id="__EVENTARGUMENT" name="__EVENTARGUMENT" runat="server"/> 

//系统的postback方法

        function __doPostBack(eventTarget, eventArgument) { 

            var theform; 

            if (window.navigator.appName.toLowerCase().indexOf("netscape") > -1) { 

                theform = document.forms["form1"]; 

            } 

            else { 

                theform = document.forms[0]; 

            }

            if (!theform)

            {

                theform=document.forms[0];

            }

            theform.__EVENTTARGET.value = eventTarget.split("$").join(":"); //将$替换成:

            theform.__EVENTARGUMENT.value = eventArgument; 

            theform.submit(); 

        }