// 图片上传
app.factory("fileReader", [
    "$q",
    "$log",
    function ($q, $log) {
      var onLoad = function (reader, deferred, scope) {
        return function () {
          scope.$apply(function () {
            deferred.resolve(reader.result);
          });
        };
      };
  
      var onError = function (reader, deferred, scope) {
        return function () {
          scope.$apply(function () {
            deferred.reject(reader.result);
          });
        };
      };
  
      var getReader = function (deferred, scope) {
        var reader = new FileReader(); //fileReader
        reader.onload = onLoad(reader, deferred, scope);
        reader.onerror = onError(reader, deferred, scope);
        return reader;
      };
  
      var readAsDataURL = function (file, scope) {
        var deferred = $q.defer();
        var reader = getReader(deferred, scope);
        reader.readAsDataURL(file);
        return deferred.promise;
      };
  
      return {
        readAsDataUrl: readAsDataURL,
      };
    },
  ]);