读取WritablePath路径下的视频不成功。

Creator 2.x
#1

引擎版本：
1.10.1

视频具体路径：
/var/mobile/Containers/Data/Application/E7D0AE83-9279-4577-89F9-051305738F2E/Documents/QYAds/20181106180055101487309.mp4

使用方法：

             cc.loader.load(val,(err, res) => {
                        if (err) {
                            cc.log('load res from local path error '+err);
                        }else{
                         this.node.getChildByName('VideoPlayer').getComponent(cc.VideoPlayer).resourceType = cc.VideoPlayer.ResourceType.LOCAL;
                            this.node.getChildByName('VideoPlayer').getComponent(cc.VideoPlayer).clip = <cc.Asset>{nativeUrl:res};   
                     }
                    }

其中res返回值/var/mobile/Containers/Data/Application/E7D0AE83-9279-4577-89F9-051305738F2E/Documents/QYAds/20181106180055101487309.mp4

报错信息：
ERROR: TypeError: url.indexOf is not a function. (In ‘url.indexOf(“http://”)’, ‘url.indexOf’ is undefined), location: script/ccui/jsb_cocos2d_ui.js:196:24
STACK:
setURL@script/ccui/jsb_cocos2d_ui.js:196:24
_updateVideoSource@src/jsb_polyfill.js:10077:24
set@src/jsb_polyfill.js:9989:38
src/project.dev.js:6983:82
src/project.dev.js:13327:81
src/jsb_polyfill.js:11939:38
src/jsb_polyfill.js:19407:21

@huanxinyin

#2

提供个demo，我分析看看什么情况。