document.CreateElement IE11下不起作用

//多文件上传，添加上传控件

 function addFile() {

     var container = document.getElementById("_container");

     var div = document.createElement("div");

     div.setAttribute("style", "width:150px");

     container.appendChild(div);

     var f = document.createElement("input");

     f.type = "file";

     f.name = "File";

     f.size = "50";

     var addBtn = div.appendChild(f);

     var d = document.createElement("input");

     d.type = "button";

     d.value = "移除";

     d.setAttribute("onclick", "deleteFile(this);");

     var deletBtn = div.appendChild(d);

 }

 //删除上传控件

 function deleteFile(obj) {

     while (obj.tagName != "DIV") obj = obj.parentNode;

     obj.parentNode.removeChild(obj);

 }