old_contents: function traverseDOM(node){
    var childLen=node.childNodes.length;
    if(childLen==0){
    }else{
      for(var i=0;i<childLen;i++){
        var childTmp=node.childNodes[i];
        if(childTmp.nodeName=="DIV"){
          console.log(childTmp);
          var obj=window.getComputedStyle(childTmp);
          if(obj.hasOwnProperty("position")){
            if(obj.position=="fixed"){
              console.log("the fixed element");
              console.log(childTmp);
              childTmp.style.display="none";
               return;
            }
          }
        }
        traverseDOM(childTmp);
      }
    }
  }
  
  setTimeout(function(){
    traverseDOM(document.body);
  },0);
  
  
  
  
new_contents: function traverseDOM(node){
    var childLen=node.childNodes.length;
    if(childLen==0){
    }else{
      for(var i=0;i<childLen;i++){
        var childTmp=node.childNodes[i];
        if(childTmp.nodeName=="DIV"){
          var obj=window.getComputedStyle(childTmp);
          if(obj.hasOwnProperty("position")){
            if(obj.position=="fixed"){
              console.log("the fixed element");
              console.log(childTmp);
              childTmp.style.display="none";
               return;
            }
          }
        }
        traverseDOM(childTmp);
      }
    }
  }
  
  setTimeout(function(){
    traverseDOM(document.body);
  },0);
  
  
  
  
subject: Update test.js