Fix a bug for preload method
Fix a bug for preload method

moccen/seajs,liupeng110112/seajs,AlvinWei1024/seajs,twoubt/seajs,tonny-zhang/seajs,longze/seajs,moccen/seajs,AlvinWei1024/seajs,MrZhengliang/seajs,longze/seajs,zwh6611/seajs,Lyfme/seajs,kaijiemo/seajs,judastree/seajs,yuhualingfeng/seajs,uestcNaldo/seajs,longze/seajs,evilemon/seajs,eleanors/SeaJS,kaijiemo/seajs,Gatsbyy/seajs,zaoli/seajs,Lyfme/seajs,lianggaolin/seajs,FrankElean/SeaJS,liupeng110112/seajs,Gatsbyy/seajs,lovelykobe/seajs,treejames/seajs,yuhualingfeng/seajs,mosoft521/seajs,zwh6611/seajs,sheldonzf/seajs,Gatsbyy/seajs,coolyhx/seajs,twoubt/seajs,FrankElean/SeaJS,miusuncle/seajs,coolyhx/seajs,jishichang/seajs,seajs/seajs,chinakids/seajs,13693100472/seajs,wenber/seajs,imcys/seajs,JeffLi1993/seajs,baiduoduo/seajs,ysxlinux/seajs,jishichang/seajs,yern/seajs,uestcNaldo/seajs,uestcNaldo/seajs,lianggaolin/seajs,mosoft521/seajs,lovelykobe/seajs,PUSEN/seajs,angelLYK/seajs,121595113/seajs,moccen/seajs,yuhualingfeng/seajs,judastree/seajs,kuier/seajs,lianggaolin/seajs,evilemon/seajs,ysxlinux/seajs,judastree/seajs,ysxlinux/seajs,seajs/seajs,lovelykobe/seajs,sheldonzf/seajs,coolyhx/seajs,FrankElean/SeaJS,baiduoduo/seajs,121595113/seajs,eleanors/SeaJS,AlvinWei1024/seajs,LzhElite/seajs,evilemon/seajs,zaoli/seajs,treejames/seajs,eleanors/SeaJS,LzhElite/seajs,mosoft521/seajs,kaijiemo/seajs,yern/seajs,lee-my/seajs,yern/seajs,liupeng110112/seajs,twoubt/seajs,sheldonzf/seajs,zaoli/seajs,jishichang/seajs,Lyfme/seajs,JeffLi1993/seajs,kuier/seajs,tonny-zhang/seajs,MrZhengliang/seajs,hbdrawn/seajs,JeffLi1993/seajs,seajs/seajs,miusuncle/seajs,angelLYK/seajs,tonny-zhang/seajs,hbdrawn/seajs,miusuncle/seajs,treejames/seajs,PUSEN/seajs,zwh6611/seajs,imcys/seajs,baiduoduo/seajs,lee-my/seajs,chinakids/seajs,angelLYK/seajs,kuier/seajs,MrZhengliang/seajs,13693100472/seajs,wenber/seajs,PUSEN/seajs,lee-my/seajs,imcys/seajs,LzhElite/seajs,wenber/seajs