基于原生JavaScript实现文件与图片拖拽上传功能

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>Title</title>
  <script src="./upload.js"></script>
  <style>
    #drop img{width: 100px;height: 100px;margin: 10px;}
  </style>
</head>
<body onload="test()">
  <div id="drop" style="width: 500px;height: 400px;background: #eee;margin: 0 auto;">
    <div style="clear: both;"></div>
  </div>
  <p style="text-align: center"><button onclick="up()">提交</button></p>
</body>
</html>

var formData = new FormData(),list={}
   function test() {
     var d = new DragUpLoads()
     d.getDragImage({id:'drop',dropCallback:function (data) {
       if(list[data.name]) return;
       list[data.name] = true
       formData.append("files", data.blob);
       formData.append("asdfas", 'asdfasdf');
       document.getElementById('drop').appendChild(data.img)
       /*
       * 返回img对象，url ,blob对象
       * */
     }})
   }
   function up() {
     console.log(formData)
    /*
    * formData 这个对象即我们要传的值
    * 通过 异步post/get 给后台即可
    * */
   }