js根据后缀判断文件是图片还是视频

function getFileType(name) {
   if(!name) return false;
   var imgType=["gif", "jpeg", "jpg", "bmp", "png"];
   var videoType=["avi","wmv","mkv","mp4","mov","rm","3gp","flv","mpg","rmvb"];
   if(RegExp("\.(" + imgType.join("|") + ")$", "i").test(name.toLowerCase())) {
      return 'image';
   } else if(RegExp("\.(" + videoType.join("|") + ")$", "i").test(name.toLowerCase())) {
      return 'video';
   } else {
	  return false;
   }
}