Angular で複数の H5 画像をアップロードする方法

angular.module('myApp')
.directive('ngFileSelect', [ '$parse', '$timeout', function($parse, $timeout) {
    return function(scope, elem, attr) {
      var fn = $parse(attr['ngFileSelect']);
      elem.bind('change', function(evt) {
        var files = [], fileList, i;
        fileList = evt.target.files;
        if (fileList != null) {
          for (i = 0; i < fileList.length; i++) {
            files.push(fileList.item(i));
          }
        }
        $timeout(function() {
          fn(scope, {
            $files : files,
            $event : evt
          });
        });
      });
    };
  }])

//上传文件预览
angular.module('myServers',[])
  .factory('fileReader', ['$q', '$log', function($q, $log) {
    var dataURItoBlob = function(dataURI) { 
      // convert base64/URLEncoded data component to raw binary data held in a string 
      var byteString; 
      if (dataURI.split(',')[0].indexOf('base64') >= 0) 
        byteString = atob(dataURI.split(',')[1]); 
      else 
        byteString = unescape(dataURI.split(',')[1]); 
      // separate out the mime component 
      var mimeString = dataURI.split(',')[0].split(':')[1].split(';')[0]; 
      // write the bytes of the string to a typed array 
      var ia = new Uint8Array(byteString.length); 
      for (var i = 0; i < byteString.length; i++) { 
        ia[i] = byteString.charCodeAt(i); 
      } 
      return new Blob([ia], { 
        type: mimeString 
      }); 
    }; 
    var onLoad = function(reader, deferred, scope,file) {
      return function() {
        scope.$apply(function() {
           var img = new Image();
          //前端压缩图片
          img.onload = function(){ 
            //resize the image using canvas 
            var canvas = document.createElement("canvas"); 
            var ctx = canvas.getContext("2d"); 
            var width = img.width; 
            var height = img.height; 
            var MAX_WIDTH = width>2500 ? width/2 : 2500; 
            var MAX_HEIGHT = height>2500 ? height/2 : 2500;
            if (width > height) { 
              if (width > MAX_WIDTH) { 
                height *= MAX_WIDTH / width; 
                width = MAX_WIDTH; 
              } 
            } else { 
              if (height > MAX_HEIGHT) { 
                width *= MAX_HEIGHT / height; 
                height = MAX_HEIGHT; 
              } 
            }
            canvas.width = width ; 
            canvas.height = height; 
            ctx.drawImage(img, 0, 0, width, height); 
            var dataURL = canvas.toDataURL('image/jpeg', 1);
            var blob = dataURItoBlob(dataURL); 
            if(blob.size > 2000 * 1024){
              dataURL = canvas.toDataURL('image/jpeg', .2);
            }else if(blob.size > 1000 * 1024){
              dataURL = canvas.toDataURL('image/jpeg', .5);
            }else{
              dataURL = canvas.toDataURL('image/jpeg', .8);
            }
            blob = dataURItoBlob(dataURL);
            deferred.resolve(blob);
          }
          img.src = URL.createObjectURL(file);
        });
      };
    };
    var onError = function(reader, deferred, scope) {
      return function() {
        scope.$apply(function() {
          deferred.reject(reader.result);
        });
      };
    };
    var onProgress = function(reader, scope) {
      return function(event) {
        scope.$broadcast("fileProgress", {
          total: event.total,
          loaded: event.loaded
        });
      };
    };
    var getReader = function(deferred, scope, file) {
      var reader = new FileReader();
      reader.onload = onLoad(reader, deferred, scope,file);
      reader.onerror = onError(reader, deferred, scope);
      reader.onprogress = onProgress(reader, scope);
      return reader;
    };
    var readAsDataURL = function(file, scope) {
      var deferred = $q.defer();
      var reader = getReader(deferred, scope,file);
      reader.readAsDataURL(file);
      return deferred.promise;
    };
    return {
      readAsDataUrl: readAsDataURL
    };
  }]);

//选择图片后执行的方法
    $scope.fileArr = [];
    $scope.imgSrcArr = [];var i = 0; //为ios上图片都为image时添加序号
    $rootScope.onFileSelect = function(files, event) {
      //预览上传图片开始
      $rootScope.startLoading();
      var $this = angular.element(event.target);
      angular.forEach(files, function(value, index) {
        var fileIn = value;
        var fileInName = fileIn.name;
        var fileType = fileInName.substring(fileInName.lastIndexOf(".") + 1, fileInName.length);
        //解决ios下所有图片都为image.jpg的bug
        if(fileIn) {
          fileInName = fileInName.split('.')[0] + i + '.' + fileType;
          i++;
        }
        attachvo.push({
          name: fileInName,
          type: fileType
        });
        fileReader.readAsDataUrl(fileIn, $scope)
          .then(function(result) {
            result.name = fileInName;
            $scope.fileArr.push(result);
            $scope.imgSrcArr.push(URL.createObjectURL(result));
　　　　　　　　　　　　　　//每次上传后清空file框，确保每次都能调用change事件
            document.querySelector('.upload').reset();
          });
        $scope.$on('fileProgress', function(event, data) {
          if(data.total == data.loaded) {
            $timeout(function() {
              //上传图片结束
              $rootScope.endLoading();
            }, 200)
          }
        });      
      });
      $rootScope.showAttachment = false;
    };return false;
    }

    

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