[widget]附件上传增加accept属性,bug修复

o2web/source/o2_core/o2/widget/Upload.js

@@ -43,7 +43,7 @@ o2.widget.Upload = new Class({
     formData_CreateUploadArea: function(){
         if (!this.uploadFileAreaNode){
             this.uploadFileAreaNode = new Element("div");
-            var html = "<input name=\"file\" "+((this.options.multiple) ? "multiple": "")+"  accept=\""+ this.options.accept +"\"/>";
+            var html = "<input name=\"file\" "+((this.options.multiple) ? "multiple": "")+"  accept="+ this.options.accept +"/>";
             this.uploadFileAreaNode.set("html", html);
             this.fileUploadNode = this.uploadFileAreaNode.getFirst();