<input type="file" name="img-up" id="img-up" value="" />

$("#img-up").on("change",function () {

                if(this.files[0]){

                    getImgBase64Data(this.files[0], function (result) {

                        console.log(result);

                    });

                }

            });

            function getImgBase64Data(file, callback) {

                var reader = new FileReader();

                reader.onload = function (e) {

                    callback(e.target.result);

                };

                reader.readAsDataURL(file); // 读取完后会调用onload方法

            }

		//取得该文件的url

		function getObjectURL(file) {

		　　var url = null ;

		　　if (window.createObjectURL!=undefined) {

		　　　　url = window.createObjectURL(file) ;

		　　} else if (window.URL!=undefined) {

		　　　　url = window.URL.createObjectURL(file) ;

		　　} else if (window.webkitURL!=undefined) {

		　　　　url = window.webkitURL.createObjectURL(file) ;

		　　}

		　　return url ;

		}

// base 64 转 blob

let dataURLtoFile = function (b64Data,filename) {

   filename = filename || "test.png";

  let mime = "image/png";

  var bstr = atob(b64Data.replace(/^data:image\/(png|jpeg|jpg);base64,/, ''));

  var n = bstr.length;

  var u8arr = new Uint8Array(n);

  while(n--){

      u8arr[n] = bstr.charCodeAt(n);

  }

  //转换成file对象

  return new File([u8arr], filename, {type:mime});

  //转换成成blob对象

  //return new Blob([u8arr],{type:mime});

  return blob;

}