ajax上传文件

<div class="upload">
  <div class="box-upload">
    <span>上传图片</span>
  </div>
  <input type="file" accept="image/*" name="img" class="uploadImg" value="">
  <img src="" alt="" id="imgimg">
</div>

$(".uploadImg").on("change",function () {

    var formData = new FormData();
    formData.append(‘img‘,this.files[0])


    $.ajax({
        url:‘/module/controller/uploadImg‘,
        data:formData,
        contentType: false,
        processData: false,
        type:‘post‘,
        dataType:‘json‘,
        success:function (res) {
            console.log(res)
        }
    })
})

function phone(a){
            var txt=a.files[0];
            var src=window.URL.createObjectURL(txt);
            return src;
        }