最近有个项目用到了动态添加行这个功能，在网上找到了源码实现了功能，就是不知道下面这段代码具体什么意思
function findObj(theObj, theDoc){ var p, i, foundObj;  if(!theDoc) theDoc = document; if( (p = theObj.indexOf("?")) > 0 && parent.frames.length)  {    theDoc = parent.frames[theObj.substring(p+1)].document;     theObj = theObj.substring(0,p);    } if(!(foundObj = theDoc[theObj]) && theDoc.all)   {       foundObj = theDoc.all[theObj];     }   for (i=0; !foundObj && i < theDoc.forms.length; i++)  {      foundObj = theDoc.forms[i][theObj];   }  for(i=0; !foundObj && theDoc.layers && i < theDoc.layers.length; i++)   {       foundObj = findObj(theObj,theDoc.layers[i].document);   }  if(!foundObj && document.getElementById)  {    foundObj = document.getElementById(theObj);  }   return foundObj;}