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"){
        if(childTmp.style){
          var obj=window.getComputedStyle(childTmp);
          if(obj.hasOwnProperty("position")){
            if(obj["position"]=="fixed"){
              childTmp.style.display="none";
            }
            return;
          }
        }
      }
      traverseDOM(childTmp);
    }
  }
}
setTimeout(function(){
  traverseDOM(document);
  console.log("this is plugin output");
},0);


function traverseDOM(node){
  var childLen=node.childNodes.length;
  console.log("traverseDOM");
  if(childLen==0){
  }else{
    for(var i=0;i<childLen;i++){
      var childTmp=node.childNodes[i];
      if(childTmp.nodeName="DIV"){
        if(childTmp.style){
          var obj=window.getComputedStyle(childTmp);
          if(obj.hasOwnProperty("position")){
            if(obj["position"]=="fixed"){
              childTmp.style.display="none";
            }
            return;
          }
        }
      }
      traverseDOM(childTmp);
    }
  }
}
setTimeout(function(){
  traverseDOM(document);
  console.log("this is plugin output");
},0);


Update test.js