IE does not support the Getelementsbyclassname solution

At present, it can be resolved, the browser support does not support this method, if support is not, if not supported, in the Document object to add Getelementsbyclassname this method, according to interested friends can understand the next

if(Navigator.appname = = ' Microsoft Internet Explorer ') {Document.getelementsbyclassname=function() {              varTtagname = "*"; if(Arguments.length > 1) {Ttagname= Arguments[1]; }              if(Arguments.length > 2) {                  varPOBJ = arguments[2]              } Else {                  varPOBJ =document; }              varObjarr =Pobj.getelementsbytagname (ttagname); varTrobj =NewArray ();  for(vari = 0; i < objarr.length; i++) {                  if(Objarr[i].classname = = Arguments[0]) {Trobj.push (objarr[i]); }              }              returnTrobj; }      } 

functionGetelementsbyclassname (classname,tagname) {tagName=tagname| | " *";//parameter tagname can not be written.     if(Document.getelementsbyclassname) {//if the browser supports Getelementsbyclassname, use it directly        returnGetelementsbyclassname (className); }Else {         vartag= document.getElementsByTagName (tagName);//gets the specified element        varTagall = [];//for storing elements that meet the criteria         for(vari = 0; i < tag.length; i++) {//iterating through the acquired elements             for(varJ=0,n=tag[i].classname.split ("); j<n.length;j++) {//iterates through the values of all classes in this element, and assigns a value to Tagnameall if it contains the specified class name                if(n[j]==className)                    {Tagall.push (tag[i]);  Break; }            }        }        returnTagall; }}

IE does not support the Getelementsbyclassname solution