修改帮助中心编辑文章正则匹配

src/main/webapp/resources/js/admin/controllers/help/HelpEditCtrl.js

@@ -33,9 +33,9 @@ define(['app/app'], function(app) {
 
         $scope.rootPath = BaseService.getRootPath();
         function switchBase64ToImg(el) {
-            var deferred = $q.defer();
+            const regex = new RegExp(':(.*?);');
             var data = el.src;
-            var arr = data.split(','), mime = arr[0].match(/:(.*?);/)[1],
+            var arr = data.split(','), mime = regex.exec(arr[0])[1],
                 bstr = atob(arr[1]), n = bstr.length, u8arr = new Uint8Array(n);
             while(n--){
                 u8arr[n] = bstr.charCodeAt(n);