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HomeWeb Front-endJS TutorialHow 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。

How to use JavaScript&jQuery to implement a scrolling bulletin board (code example)

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 (&#39;#express&#39;);      //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 (&#39;#express&#39;);        //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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