快速评分constrate=r=>'★★★★★☆☆☆☆☆'.slice(5-r,10-r);rate(0);//☆☆☆☆☆rate(1);//★☆☆☆☆...rate(5);//★★★★★2的n次方1<<2//41<<3//81<<4//16快速切换0/1lettoggle=0;toggle^=1;//1toggle^=1;//0