这个initPopUp函数 是在我调用的Scripts/ScriptByColin/subModal/subModal.js中的  我前台执行showPopWin()的时候 它会进这个js 先执行initPopUp函数  再执行showPopWin()函数 但是后台进去的话 初始化这个函数并没有执行 而是直接执行showPopWin()

你能把Scripts/ScriptByColin/subModal/subModal.js中的代码贴出来看看吗？我平空想象真的猜不透@enpos: 

@Loui: 

/**  * SUBMODAL v1.6  * Used for displaying DHTML only popups instead of using buggy modal windows.  *  * By Subimage LLC  * http://www.subimage.com  *  * Contributions by:  *  Eric Angel - tab index code  *  Scott - hiding/showing selects for IE users  * Todd Huss - inserting modal dynamically and anchor classes  *  * Up to date code can be found at http://submodal.googlecode.com  */

// Popup code var gPopupMask = null; var gPopupContainer = null; var gPopFrame = null; var gReturnFunc; var gPopupIsShown = false; var gDefaultPage = "Scripts/subModal/loading.html"; var gHideSelects = false; var gReturnVal = null;

var gTabIndexes = new Array(); // Pre-defined list of tags we want to disable/enable tabbing into var gTabbableTags = new Array("A","BUTTON","TEXTAREA","INPUT","IFRAME"); 

// If using Mozilla or Firefox, use Tab-key trap. if (!document.all) {  document.onkeypress = keyDownHandler; }

/**  * Initializes popup code on load.   */ function initPopUp() {  // Add the HTML to the body  theBody = document.getElementsByTagName('BODY')[0];  popmask = document.createElement('div');  popmask.id = 'popupMask';  popcont = document.createElement('div');  popcont.id = 'popupContainer';  popcont.innerHTML = '' +   '<div id="popupInner">' +    '<div id="popupTitleBar">' +     '<div id="popupTitle"></div>' +     '<div id="popupControls" onclick="hidePopWin(false);"  >' +      '<img style=" width:0; left:0; display:none;" id="popCloseBox" />' +     '</div>' +    '</div>' +    '<iframe src="'+ gDefaultPage +'" style="width:100%;height:100%;background-color:transparent;" scrolling="auto" frameborder="0" allowtransparency="true" id="popupFrame" name="popupFrame" width="100%" height="100%"></iframe>' +   '</div>';  theBody.appendChild(popmask);  theBody.appendChild(popcont);    gPopupMask = document.getElementById("popupMask");  gPopupContainer = document.getElementById("popupContainer");  gPopFrame = document.getElementById("popupFrame");     // check to see if this is IE version 6 or lower. hide select boxes if so  // maybe they'll fix this in version 7?  var brsVersion = parseInt(window.navigator.appVersion.charAt(0), 10);  if (brsVersion <= 6 && window.navigator.userAgent.indexOf("MSIE") > -1) {   gHideSelects = true;  }    // Add onclick handlers to 'a' elements of class submodal or submodal-width-height  var elms = document.getElementsByTagName('a');  for (i = 0; i < elms.length; i++) {   if (elms[i].className.indexOf("submodal") == 0) {    // var onclick = 'function (){showPopWin(\''+elms[i].href+'\','+width+', '+height+', null);return false;};';    // elms[i].onclick = eval(onclick);    elms[i].onclick = function(){     // default width and height     var width = 400;     var height = 200;     // Parse out optional width and height from className     params = this.className.split('-');     if (params.length == 3) {      width = parseInt(params[1]);      height = parseInt(params[2]);     }     showPopWin(this.href,width,height,null); return false;    }   }  } } addEvent(window, "load", initPopUp);

 /**  * @argument width - int in pixels  * @argument height - int in pixels  * @argument url - url to display  * @argument returnFunc - function to call when returning true from the window.  * @argument showCloseBox - show the close box - default true  */ function showPopWin(url, width, height, returnFunc, showCloseBox) {     //if exists document.getElementById("popupControls");     if (document.getElementById("popupControls") == null) {         initPopUp();     }  // show or hide the window close widget  if (showCloseBox == null || showCloseBox == true) {      document.getElementById("popupControls").style.display = "block";  } else {  document.getElementById("popupControls").style.display = "none";  }  gPopupIsShown = true;  disableTabIndexes();  gPopupMask.style.display = "block";  gPopupContainer.style.display = "block";  // calculate where to place the window on screen  centerPopWin(width, height);    var titleBarHeight = parseInt(document.getElementById("popupTitleBar").offsetHeight, 10);

 gPopupContainer.style.width = width + "px";  gPopupContainer.style.height = (height+titleBarHeight) + "px";    setMaskSize();

 // need to set the width of the iframe to the title bar width because of the dropshadow  // some oddness was occuring and causing the frame to poke outside the border in IE6  gPopFrame.style.width = parseInt(document.getElementById("popupTitleBar").offsetWidth, 10) + "px";  gPopFrame.style.height = (height) + "px";

 // set the url  var SDTail;//定义URL尾，生成随机数，防止浏览器缓存 by sinodier 2011年9月3日 15:30:29  if (url!=null)  {          if(url.indexOf("?")>-1 )          {              SDTail = '&tail=' + Math.round(Math.random() * 10000);          }          else          {              SDTail = '?tail=' + Math.round(Math.random() * 10000);          }          url = url + SDTail;  }

 gPopFrame.src = url ;

 gReturnFunc = returnFunc;  // for IE  if (gHideSelects == true) {   hideSelectBoxes();  }    window.setTimeout("setPopTitle();", 600); }

// var gi = 0; function centerPopWin(width, height) {  if (gPopupIsShown == true) {   if (width == null || isNaN(width)) {    width = gPopupContainer.offsetWidth;   }   if (height == null) {    height = gPopupContainer.offsetHeight;   }      //var theBody = document.documentElement;   var theBody = document.getElementsByTagName("BODY")[0];   //theBody.style.overflow = "hidden";   var scTop = parseInt(getScrollTop(),10);   var scLeft = parseInt(theBody.scrollLeft,10);     setMaskSize();      //window.status = gPopupMask.style.top + " " + gPopupMask.style.left + " " + gi++;      var titleBarHeight = parseInt(document.getElementById("popupTitleBar").offsetHeight, 10);      var fullHeight = getViewportHeight();   var fullWidth = getViewportWidth();      gPopupContainer.style.top = (scTop + ((fullHeight - (height+titleBarHeight)) / 2)) + "px";   gPopupContainer.style.left =  (scLeft + ((fullWidth - width) / 2)) + "px";   //alert(fullWidth + " " + width + " " + gPopupContainer.style.left);  } } addEvent(window, "resize", centerPopWin); addEvent(window, "scroll", centerPopWin); window.onscroll = centerPopWin;

/**  * Sets the size of the popup mask.  *  */ function setMaskSize() {  var theBody = document.getElementsByTagName("BODY")[0];      var fullHeight = getViewportHeight();  var fullWidth = getViewportWidth();    // Determine what's bigger, scrollHeight or fullHeight / width  if (fullHeight > theBody.scrollHeight) {   popHeight = fullHeight;  } else {   popHeight = theBody.scrollHeight;  }    if (fullWidth > theBody.scrollWidth) {   popWidth = fullWidth;  } else {   popWidth = theBody.scrollWidth;  }    gPopupMask.style.height = popHeight + "px";  gPopupMask.style.width = popWidth + "px"; }

/**  * @argument callReturnFunc - bool - determines if we call the return function specified  * @argument returnVal - anything - return value  */ function hidePopWin(callReturnFunc) {  gPopupIsShown = false;  var theBody = document.getElementsByTagName("BODY")[0];  theBody.style.overflow = "";  restoreTabIndexes();  if (gPopupMask == null) {   return;  }  gPopupMask.style.display = "none";  gPopupContainer.style.display = "none";  if (callReturnFunc == true && gReturnFunc != null) {   // Set the return code to run in a timeout.   // Was having issues using with an Ajax.Request();   gReturnVal = window.frames["popupFrame"].returnVal;   window.setTimeout('gReturnFunc(gReturnVal);', 1);  }  gPopFrame.src = gDefaultPage;  // display all select boxes  if (gHideSelects == true) {   displaySelectBoxes();  } }

/**  * Sets the popup title based on the title of the html document it contains.  * Uses a timeout to keep checking until the title is valid.  */ function setPopTitle() {  return;  if (window.frames["popupFrame"].document.title == null) {   window.setTimeout("setPopTitle();", 10);  } else {   document.getElementById("popupTitle").innerHTML = window.frames["popupFrame"].document.title;  } }

// Tab key trap. iff popup is shown and key was [TAB], suppress it. // @argument e - event - keyboard event that caused this function to be called. function keyDownHandler(e) {     if (gPopupIsShown && e.keyCode == 9)  return false; }

// For IE.  Go through predefined tags and disable tabbing into them. function disableTabIndexes() {  if (document.all) {   var i = 0;   for (var j = 0; j < gTabbableTags.length; j++) {    var tagElements = document.getElementsByTagName(gTabbableTags[j]);    for (var k = 0 ; k < tagElements.length; k++) {     gTabIndexes[i] = tagElements[k].tabIndex;     tagElements[k].tabIndex="-1";     i++;    }   }  } }

// For IE. Restore tab-indexes. function restoreTabIndexes() {  if (document.all) {   var i = 0;   for (var j = 0; j < gTabbableTags.length; j++) {    var tagElements = document.getElementsByTagName(gTabbableTags[j]);    for (var k = 0 ; k < tagElements.length; k++) {     tagElements[k].tabIndex = gTabIndexes[i];     tagElements[k].tabEnabled = true;     i++;    }   }  } }

/**  * Hides all drop down form select boxes on the screen so they do not appear above the mask layer.  * IE has a problem with wanted select form tags to always be the topmost z-index or layer  *  * Thanks for the code Scott!  */ function hideSelectBoxes() {   var x = document.getElementsByTagName("SELECT");

  for (i=0;x && i < x.length; i++) {     x[i].style.visibility = "hidden";   } }

/**  * Makes all drop down form select boxes on the screen visible so they do not  * reappear after the dialog is closed.  *  * IE has a problem with wanting select form tags to always be the  * topmost z-index or layer.  */ function displaySelectBoxes() {   var x = document.getElementsByTagName("SELECT");

  for (i=0;x && i < x.length; i++){     x[i].style.visibility = "visible";   } }

从原理上看不出来什么问题，建议你写个小的demo来测，试把js文件中的慢慢的减少，用排除法。@enpos: 

经验证 不加标签是 htm生成代码为：

<script type="text/javascript">
//<![CDATA[
set()//]]>
</script>

加标签 生成代码为：

<script type="text/javascript">
//<![CDATA[
<script>set()</script>//]]>
</script>

加了甚至报错 而且我写了这么长时间一直没加这个标签 我一般在response.write时候会加这个标签

@enpos: 

恩，没注意第三个参数写的True

@Rich.T: :)么事么事

@enpos: 

我觉得应该是页面还没有加载完就执行了,这样看看

this.Page.ClientScript.RegisterStartupScript(this.GetType(), "test", "window.onload=function(){set();}", true);

@Rich.T: 我也觉得还是没有加载的问题  你的方法试了还是一样的 没办法了 改了下js文件  我在前台调用js中方法showPopWin时判断有没有初始化 没有初始化的时候 初始化下就好了  但是就是不知道问题所在