setAttribute和getAttribute

<script>
           dom=(function(){
           var fixAttr={
                  tabindex:‘tabIndex‘,
                  readonly:‘readOnly‘,
                  ‘for‘:‘htmlFor‘,
                  ‘class‘:‘className‘,
                  maxlength:‘maxLength‘,
                  cellspacing:‘cellSpacing‘,
                  cellpadding:‘cellPadding‘,
                  rowspan:‘rowSpan‘,
                  colspan:‘colSpan‘,
                  usemap:‘useMap‘,
                  frameborder:‘frameBorder‘,
                  contenteditable:‘contentEditable‘
           },
        
           //模拟设置attribute, 
          div=document.createElement(‘div‘);
          div.setAttribute(‘class‘,‘t‘);
        
          var supportSetAttr = div.className === ‘t‘;
        
           return {
                   setAttr:function(el, name, val){
                        el.setAttribute(supportSetAttr ? name : (fixAttr[name] || name), val);
                   },
                   getAttr:function(el, name){
                        return el.getAttribute(supportSetAttr ? name : (fixAttr[name] || name));
                    }
              }
        })();
        
        window.onload=function(){
               var mydiv=document.getElementById("d1");
               dom.setAttr(mydiv, ‘class‘, ‘bg‘);
        }
    </script>