使用AJAX实现上传文件

<form   id="uploadForm"  method="post" enctype="multipart/form-data">
   <label  >上传电子书</label>
   <input type="file"  name="file" >
   <button  id="upload" type="button"  name="button" >上传</button>
</form>

$("#upload").click(function () {
   var formData = new FormData($('#uploadForm')[0]);
   $.ajax({
    type: 'post',
    url: "https://****:8443/fileUpload", //上传文件的请求路径必须是绝对路劲
     data: formData,
     cache: false,
     processData: false,
     contentType: false,
      }).success(function (data) {
        console.log(data);
        alert("上传成功"+data);
        filename=data;
      }).error(function () {
         alert("上传失败");
     });
    });