js+php implement asynchronous drag and drop upload file

Asynchronous drag-and-drop file upload-small instance

Upload.html

<!  DOCTYPE html><!--to the license header, choose License Headers in Project properties.to change this template File, choose Tools | Templatesand Open the template in the editor.-->
upload.php

<?phpheader ("Content-type:text/html;charset=utf-8"), if (Is_uploaded_file ($_files[' AA ' [' Tmp_name '])) {    Move_uploaded_file ($_files[' AA '] [' tmp_name '], "./". Iconv ("UTF-8", "GBK", $_files[' AA ' [' name ']));    echo ' 1 ';}
Xmlhttpreuest.js

function ajaxfunction () {var xmlHttp; try  {  //Firefox, Opera 8.0+, Safari  xmlhttp=new XMLHttpRequest (); 
  } catch (E)  {////Internet Explorer  try   {   xmlhttp=new activexobject ("msxml2.xmlhttp");   }  catch (E)   {   try     {     xmlhttp=new activexobject ("Microsoft.XMLHTTP");     }   catch (E)     {     alert ("Your browser does not support ajax! ");     return false;}}  }  return xmlHttp;}
The above mentioned is the whole content of this article, I hope you can like.