这个判断是什么意思?
if (index<num) {
$(this).css("background-position","0 -26px")
}else{
$(this).css("background-position","0 0")
}
if (index<num) {
$(this).css("background-position","0 -26px")
}else{
$(this).css("background-position","0 0")
}
2017-11-30
举报