Angularjs上传文件组件flowjs功能

<form class="panel panel-default" 
   flow-init="{target: 'url',singleFile:false,testChunks:false}" 
   flow-name="vm.flow" 
   flow-files-added="!!{pem:1}[$file.getExtension()]" 
   flow-file-success="vm.action.importCAData($message)"> 
</form> 

<span  deep="8">{ 
 "flow-init":"初始化上传的属性值", 
 "target":"请求接口路径，对应到后台server端请求", 
 "singleFile":"是否选择单文件上传，因为flowjs默认是支持多文件上传的， 
        当然也有的需求会需要单文件上传，取值为true或false." 
        "true是只支持单文件上传，false支持多文件上传，记得一定是boolean类型的." 
 "testChunks":"flowjs上传是分片的，所以他不会只往后台发送一次请求，如果文件比较大， 
        它会分多片上传，然后等所有的都上传文成，" 
        "他会去合成一个整体的文件，而这个属性设置为true之后就会去检测一下该请求在后台是否开启， 
        如果开了就会在下次即使重启或者浏览器奔溃后继续上传，我的理解应该是续传吧", 
 "flow-files-added":"可以用来限制上传文件的格式，比如excel，pem，jpeg，png等格式要求!!{pem:1,png:1}", 
 "flow-file-success":"上传成功之后的回调函数，你可以在这里面处理上传之后的其他操作。比如使用这个组件的时候会和其他表单项一起提交", 
           "这时我们需要将文件的上传路径，文件名字和其他表单项一起提交到后台，而该组件不支持参数传递，也就是使用这个组件", 
           "分为两步，第一步：点击上传，先将文件上传到服务器指定路径。同时后台返回文件路径，文件大小，文件名称等与文件相关的信息", 
           "第二步：将后台返回的文件信息和其他表单项一起封装到一个对象中，发送给后台。后台接到请求，将上传信息进行入库操作" 
}</span> 

<form class="panel panel-default" 
   flow-init="{target: 'api/ham/tool/certificate/importCa',singleFile:true,testChunks:false}" 
   flow-name="vm.flow" 
   flow-file-added="!!{pem:1}[$file.getExtension()]" 
   flow-file-success="vm.action.importCAData($message)"> 
   <div class="panel-heading"> 
      <h5 class="app-heading"> 
         upload file 
      </h5> 
   </div> 
   <div class="panel-body"> 
      <div class="form-horizontal"> 
         <div class="asterisk-info">{{::'button-label.asterisk' | i18next }}</div> 
         <div class="form-group"> 
            <label class="col-md-3 control-label">*{{::'am.secondaryMenu.tools.certificate.item.uploadCAFile'|i18next}}</label> 
            <div class="col-md-6 " > 
               <div class="file-name-list" > 
                  <p ng-repeat="file in $flow.files" > 
                     {{$index+1}}  {{file.name}} 
                  </p> 
               </div> 
            </div> 
            <span class="btn btn-primary col-md-1"  flow-btn>{{::'am.secondaryMenu.tools.certificate.item.upload'|i18next}}</span> 
         </div> 
      </div> 
   </div> 
   <div class="panel-footer"> 
      <div class="text-right"> 
         <button id="sampleOne-edit" type="button" class="btn btn-primary" 
             ng-click="vm.action.commitCAFile($flow)" ng-disabled="$flow.files.length < 1" 
             title="{{::'button-label.import' | i18next}}">{{::'button-label.import' | i18next}} 
         </button> 
      </div> 
   </div> 
</form> 

vm.action.importCAData = function (responseResult) { 
        console.info('importCAData'); 
        vm.action.CAName = angular.fromJson(responseResult).data; 
        //var data = responseResult.data; 
        //data.keyPasswd = vm.cache.currentItem.keyPasswd; 
        var result = angular.fromJson(responseResult).result; 
        var errorMessage = angular.fromJson(responseResult).errorMessage; 
        if(result == "success"){ 
          vm.cache.caFlag = true; 
          vm.cache.alert._success("Upload CA certificates successfully!", vm.alertConfig); 
        }else { 
          vm.caDisabled = false; 
          vm.cache.alert._error(errorMessage, vm.alertConfig); 
        } 
      } 

//save the form  
      vm.action.createItem = function () { 
        vm.action.data.keyPasswd = vm.cache.currentItem.keyPasswd; 
        vm.action.data.CAName = vm.action.CAName; 
        var data = {}; 
        data.caFileName = vm.action.CAName; 
        data.fileName = vm.action.data.fileName; 
        data.from = vm.action.data.from; 
        data.isExpiryStatus = vm.action.data.isExpiryStatus; 
        data.name = vm.action.data.name; 
        data.to = vm.action.data.to; 
        data.type = vm.action.data.type; 
        data.keyPasswd = vm.cache.currentItem.keyPasswd; 
        data.usingStatus = vm.action.data.usingStatus; 
        data.validityStartTime = vm.action.data.validityStartTime; 
        data.validityStopTime = vm.action.data.validityStopTime; 
        amCertificateService.createItem(data).then(function success(responseResult) { 
            if (responseResult.errorCode == 0) { 
              vm.action.reset(); 
              vm.cache.alert._success('Create radius server certificate successfully ', vm.alertConfig); 
            } else { 
              vm.cache.alert._error(responseResult.translated.errorMessageTranslated, vm.alertConfig); 
            } 
            amCertificateService.getList(); 
          }) 
          .catch(function fail(e) { 
            vm.cache.alert._error(""); 
          }) 
          .finally(function () { 
            vm.action.reset(); 
          }); 
      };