


How to use JavaScript&jQuery to implement a scrolling bulletin board (code example)
本篇文章给大家带来的内容是关于如何利用JavaScript&jQuery实现滚动公告栏(代码实例),有一定的参考价值,有需要的朋友可以参考一下,希望对你有所帮助。
首先看HTML结构,css样式这里不再给出
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js代码
请首先确保已经引入jQuery
//滚动字 //确保绝对定位 //使用定时函数 var top=0; var t = setInterval(function () { //先设置margin-top为0 $("#express li:first").css("margin-top",top); //li的高度为25,故这里以25判断第一行是否走出ul。 if(top<-25){ //如果第一行已经走出ul,将top归零,为下个li做准备 top=0; //这句话的意思是,先将首行的top设为0,拷贝该行,放置最后一行 //注意,如果这里不将第一行的top归零,拷贝后他将保持top=-25的状态,效果就是叠加在最后一行上。 $("#express li:first").css("margin-top",top).clone(true).appendTo ('#express'); //移除首行,这时第二行变为首行 $("#express li:first").remove(); }else{ //如果第一行还未走出ul,top自减 top-=1; } },50);
额外的代码
实现当滚动时,鼠标放置后可以停止,移出时仍可以进行
//当鼠标放置后停止,松开继续走 $("#express li").hover(function() { //清除定时 clearInterval(t); }, function() { t = setInterval(function () { //先设置margin-top为0 $("#express li:first").css("margin-top",top); //li的高度为25,故这里以25判断第一行是否走出ul。 if(top<-25){ //如果第一行已经走出ul,将top归零,为下个li做准备 top=0; //这句话的意思是,先将首行的top设为0,拷贝该行,放置最后一行 //注意,如果这里不将第一行的top归零,拷贝后他将保持top=-25的状态,效果就是叠加在最后一行上。 $("#express li:first").css("margin-top",top).clone(true).appendTo ('#express'); //移除首行,这时第二行变为首行 $("#express li:first").remove(); }else{ //如果第一行还未走出ul,top自减 top-=1; } },50); });
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