Angularjs 无法在fileReader.onload函数中获取$scope变量

我用的是这样的东西

app.controller('techiesClub', function($scope, $http) {
  $scope.firstName = "John";
  $scope.lastName = "Doe";

    $scope.asdf = "ankur";
    $scope.uploadImage = function () {
        alert($scope.asdf);            ////////////WORKS WELL
        var filesSelected = document.getElementById("upload").files;
        if (filesSelected.length > 0) {
          var fileToLoad = filesSelected[0];

          var fileReader = new FileReader();

          fileReader.onload = function(fileLoadedEvent, ss) {
            var srcData = fileLoadedEvent.target.result; // <--- data: base64

             $scope.asdf = srcData;   //////////////////NOT WORKING

          }
          debugger;
          fileReader.readAsDataURL(fileToLoad, $scope);
        }
    }
});

app.controller（'techiesClub'，函数（$scope，$http）{
$scope.firstName=“John”；
$scope.lastName=“Doe”；
$scope.asdf=“ankur”；
$scope.uploadImage=函数（）{
警报（$scope.asdf）；//效果良好
var fileselected=document.getElementById（“上载”）.files；
如果（fileselected.length>0）{
var fileToLoad=fileselected[0]；
var fileReader=newfilereader（）；
fileReader.onload=函数（fileLoadedEvent，ss）{
var srcData=fileloadevent.target.result；//Ankur

我们可以用这种方式重写html

 <input type="file" id="upload" name="pic" class="form-control" onchange="angular.element(this).scope().uploadImage(this);">



这里是JS代码段..我正在尝试Blob版本

$scope.uploadImage = function ($event) {
    alert($scope.asdf);            ////////////WORKS WELL
    var filesSelected = $event.files;
    if (filesSelected.length > 0) {
      var fileToLoad = filesSelected[0];
      var _ULR = window.URL || window.webkitURL;
      var img = new Image();
      img.onload = function() {
        var srcData = this.src; // <--- data: blob
         $scope.asdf = srcData;   //////////////////NOT WORKING
      };debugger;
      img.src =_ULR.createObjectURL(fileToLoad);   

    }
}

$scope.uploadImage=函数（$event）{
警报（$scope.asdf）；//效果良好
var fileselected=$event.files；
如果（fileselected.length>0）{
var fileToLoad=fileselected[0]；
var _ULR=window.URL | | window.webkitURL；
var img=新图像（）；
img.onload=函数（）{
var srcData=this.src；//我认为您缺少解决方案中的关键点。我只是更改了您访问base64内容的方式。它应该可以工作

$scope.uploadImage = function () {
    alert($scope.asdf);            ////////////WORKS WELL
    var filesSelected = document.getElementById("upload").files;
    if (filesSelected.length > 0) {
      var fileToLoad = filesSelected[0];

      var fileReader = new FileReader();

      fileReader.onload = function(fileLoadedEvent) {
        var srcData = fileReader.result; // <--- data: base64

         $scope.asdf = srcData;   //////////////////NOT WORKING

      }
      debugger;
      fileReader.readAsDataURL(fileToLoad);
    }
}

$scope.uploadImage=函数（）{
警报（$scope.asdf）；//效果良好
var fileselected=document.getElementById（“上载”）.files；
如果（fileselected.length>0）{
var fileToLoad=fileselected[0]；
var fileReader=newfilereader（）；
fileReader.onload=函数（fileLoadedEvent）{
var srcData=fileReader.result//
$scope.uploadImage = function () {
    alert($scope.asdf);            ////////////WORKS WELL
    var filesSelected = document.getElementById("upload").files;
    if (filesSelected.length > 0) {
      var fileToLoad = filesSelected[0];

      var fileReader = new FileReader();

      fileReader.onload = function(fileLoadedEvent) {
        var srcData = fileReader.result; // <--- data: base64

         $scope.asdf = srcData;   //////////////////NOT WORKING

      }
      debugger;
      fileReader.readAsDataURL(fileToLoad);
    }
}