触发键盘事件,WebKit键盘事件不触发

我有一个javascript代码,它监听按下的“返回”键,
适用于除WebKit浏览器以外的所有浏览器 .

我知道Webkits最近 changes to keyboard event handling .
我找不到正确的解决方案 in this detailed explanation .

这里是 code .

function addEventHandler(node,type,fn){
   if(typeof window.event !== "undefined"){
            /* Internet Explorer way */
            node.attachEvent( "on" + type, fn );
   } else {
           /* FF & Other Browsers */
           node.addEventListener( type, fn,false );
   }
} 


function detectSubmit(){
    searchTextInput = document.getElementById("txtSearch")
    addEventHandler(searchTextInput,"keydown",triggerSearch);
}

function triggerSearch(e){
  //getting the character that was pressed cross browser. 
     var key = e.keycode ? e.keycode : e.which;
  //detect if the return key was pressed. 
    if(key==13){
      alert("return clicked");
    }
}

   addEventHandler(window,"load",detectSubmit);