Angular下H5上传图片的方法（可多张上传）

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;    }

<ul class="upload-view-ul">    <li ng-repeat="src in imgSrcArr" class="pull-left" ng-click="delCurUpload(src)"       ng-class="{'row-last': (($index+1) % 5==0)}">      <span>x</span>      <em ng-if='nrc'>{{formData.attachvo[$index].attachmentType}}</em>      <img ng-src="{{src}}">    </li>    <div class="attachment" pop-type-select ng-if="nrc">+</div>    <div class="attachment" ng-if="!nrc">      +      <form class="upload">        <input type="file" name="file[]" ng-file-select="onFileSelect($files, $event)" multiple>      </form>    </div>  </ul>

this.FormdataPost = function(pathUrl, formId, formData, files) {    var fd = new FormData();    fd.append('formId', formId);    if(files && angular.isArray(files)) {      files.forEach(function(item) {        fd.append('file', item, item.name);      });    }    fd.append('formData', angular.toJson(formData, true));    var httpConfig = {      headers: {        'Authorization': 'Bearer ' + this.token,        'Content-Type': undefined      },      transformRequest: angular.identity    };    return $http.post(rootUrl + pathUrl, fd, httpConfig).then(function(data) {      return data;    }).catch(function(error) {      $rootScope.interfaceName = pathUrl;      $rootScope.setNewWortStatus({        status: error.status,        errInfo: error.data && error.data.statusInfo || ''      });      return error;    });  }