js判斷回車，判斷焦點控件

  document.onkeydown=function(event){
        e = event ? event :(window.event ? window.event : null);
        if(e.keyCode==13){ //判斷是否回車
          
            if(document.activeElement.id="EColChar6D"){ //焦點所在ID
              
                return false;
            }
            return false;
        }
    }