间歇、无缝滚动效果(用gif录制的效果不是很好,有兴趣的可以down代码),具体内容如下
代码:
<!DOCTYPE html> <html lang=\"en\"> <head> <meta charset=\"UTF-8\"> <title>无缝滚动</title> <style> *{margin:0;padding:0;} .box{width: 500px;height: 400px;margin:40px auto;background: #ccc;overflow: hidden;} .block{position: relative;width: 500px;height: 400px;overflow: hidden;} .item{height: 40px;background: red;color: #fff;line-height: 40px;text-align: center;} .item:nth-child(2n){background: #000} </style> <script> var scrollUp=(function(){ return function(json){ var objScroll = document.getElementById(json.id); objScroll.scrollTop = 0; objScroll.innerHTML += objScroll.innerHTML; if(json.on){ function scrollIng(){ if(objScroll.scrollTop >= objScroll.scrollHeight) { objScroll.scrollTop = 0; }else{ objScroll.scrollTop ++; } } var myScroll = setInterval(function(){scrollIng()},30); objScroll.onmouseover = function(){ clearInterval(myScroll); } objScroll.onmouseout = function(){ myScroll = setInterval(function(){scrollIng()},30); } }else{ var timer; function startScroll(){ timer=setInterval(function(){scrollUp()},30); objScroll.scrollTop++; } function scrollUp(){ if(objScroll.scrollTop % json.height==0){ clearInterval(timer); setTimeout(startScroll,2000); }else{ objScroll.scrollTop++; if(objScroll.scrollTop >= objScroll.scrollHeight/2){ objScroll.scrollTop =0; } } } setTimeout(startScroll,1000); } } })() window.onload=function(){ //on:间歇滚动/无缝滚动 height:间歇滚动的高度 scrollUp({on:true,id:\'block\'}); scrollUp({id:\'block2\',height:120}); } </script> </head> <body> <div class=\"box\"> <div class=\"block\" id=\"block\"> <div class=\"item\">1无缝滚动</div> <div class=\"item\">2无缝滚动</div> <div class=\"item\">3无缝滚动</div> <div class=\"item\">4无缝滚动</div> <div class=\"item\">5无缝滚动</div> <div class=\"item\">6无缝滚动</div> <div class=\"item\">7无缝滚动</div> <div class=\"item\">8无缝滚动</div> <div class=\"item\">9无缝滚动</div> <div class=\"item\">10无缝滚动</div> <div class=\"item\">11无缝滚动</div> <div class=\"item\">12无缝滚动</div> <div class=\"item\">13无缝滚动</div> <div class=\"item\">14无缝滚动</div> <div class=\"item\">15无缝滚动</div> </div> </div> <div class=\"box\"> <div class=\"block\" id=\"block2\"> <div class=\"item\">1间歇滚动</div> <div class=\"item\">2间歇滚动</div> <div class=\"item\">3间歇滚动</div> <div class=\"item\">4间歇滚动</div> <div class=\"item\">5间歇滚动</div> <div class=\"item\">6间歇滚动</div> <div class=\"item\">7间歇滚动</div> <div class=\"item\">8间歇滚动</div> <div class=\"item\">9间歇滚动</div> <div class=\"item\">10间歇滚动</div> <div class=\"item\">11间歇滚动</div> <div class=\"item\">12间歇滚动</div> <div class=\"item\">13间歇滚动</div> <div class=\"item\">14间歇滚动</div> <div class=\"item\">15间歇滚动</div> </div> </div> </body> </html>
注意点:
1.盒子块要css 溢出隐藏:overflow:hidden
2.有两个功能:间歇滚动/无缝滚动
3.先复制一块一模一样的代码,无缝滚动:执行定时器一直增加scrollTop值,当scrollTop值大于盒子高度,在设置scrollTop为0,重新来过。间歇滚动在此基础上加了setTimeout,间歇执行,在scrollTop到达指定的height停止
4.疑问:代码中setInterval(function(){scrollIng()},30);这样写才可以执行,setInterval(\'scrollIng()\',30);这样就不行,有没有大神指导下,两者有啥区别?是啥机制?
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