 * add extend().
 * add extend().

XiongWanTai/zui,easysoft/zui,Eric-Zhong/zui,Eric-Zhong/zui,2947721120/zui,ppmon/zui,kunloon/zui,elton0895/zui,ppmon/zui,404904728/ui_zui,2947721120/zui,fannyfinal/zui,elton0895/zui,a4435351/zui,easysoft/zui,wenlian/zui,XiongWanTai/zui,kunloon/zui,xautchao/zui,wenlian/zui,a4435351/zui,fhchina/zui,fhchina/zui,xautchao/zui,fannyfinal/zui