JS实现无缝循环marquee滚动效果

 #marquee_zxd { border: 1px solid red; white-space: nowrap; overflow: hidden; width: 500px; padding-top: 5px; } #marquee_zxd img { height: 100px; } 
 
 

 /**除了Chrome以外的浏览器可以通过scrollLeft属性控制滚动*/ function scrolleft(obj){ var $obj = $(obj); //到右边顶端后不会再变 //var temp = obj.scrollLeft; //obj.scrollLeft++; var temp = $obj.scrollLeft(); //console.log(temp); $obj.scrollLeft(temp+1); //当滚动条到达右边顶端时;或本身长度不够不好滚动(漫出才好滚) //if(obj.scrollLeft == temp){ if($obj.scrollLeft() == temp){ obj.innerHTML += obj.innerHTML; console.log('copy'); } //当滚动条滚动了初始内容的宽度时，滚动条回到最左端，模拟循环 //if (obj.scrollLeft >= obj.firstChild.offsetWidth) //  obj.scrollLeft = 0; if ($obj.scrollLeft() >= obj.firstChild.offsetWidth) $obj.scrollLeft(0); } /**除了Chrome以外的浏览器可以通过scrolleft()滚动*/ function initMarquee(){ var aaa = document.getElementById('marquee_zxd'); var MyMar = setInterval(function(){ scrolleft(aaa); }, 20); //鼠标移上时清除定时器达到滚动停止的目的 aaa.onmouseover=function() {clearInterval(MyMar);}; //鼠标移开时重设定时器 aaa.onmouseout=function() {MyMar = setInterval(function(){ scrolleft(aaa); }, 20);}; } /**Chrome定时器循环函数，通过relative布局的left属性控制滚动*/ function scrolleftChrome($marquee_inner, inner_width){ var width = parseInt(inner_width); var leftPx = $marquee_inner.css("left"); //兼容IE if(leftPx == 'auto') leftPx = 0; //位置左移 var left = parseInt(leftPx); left = left - 1; //到顶归位 if(left <= -width) left = 0; $marquee_inner.css("left", left); //console.log(width + ", " + left); } /**Chrome浏览器可以通过scrolleftChrome滚动*/ function initMarqueeChrome() { //局部变量不污染全局变量空间 var $marquee_inner = $('#marquee_inner'); //原内容大小 var inner_width = $marquee_inner.css('width'); //复制一份原内容 var innerHtml = $marquee_inner.html(); $marquee_inner.html(innerHtml + innerHtml); console.log(inner_width); //参数采用字符串形式的缺陷：参数不能被周期性改变,参数必须是全局变量 //var MyMar = setInterval("scrolleftChrome($marquee_inner, inner_width)", 5000); var MyMar = setInterval(function(){ //参数不污染全局变量空间 scrolleftChrome($marquee_inner, inner_width); }, 50); var marquee_zxd = document.getElementById('marquee_zxd'); //鼠标移上时清除定时器达到滚动停止的目的 marquee_zxd.onmouseover=function() {clearInterval(MyMar);}; //鼠标移开时重设定时器 marquee_zxd.onmouseout=function() { //参数采用字符串形式的缺陷：参数不能被周期性改变,参数必须是全局变量 //MyMar = setInterval("scrolleftChrome($marquee_inner, inner_width)", 50); MyMar = setInterval(function(){ //参数不污染全局变量空间 scrolleftChrome($marquee_inner, inner_width); }, 50); }; } $(function(){ var ua = window.navigator.userAgent; var isIE = window.ActiveXObject != undefined && ua.indexOf("MSIE") != -1; var isFirefox = ua.indexOf("Firefox") != -1; var isChrome = ua.indexOf("Chrome") && window.chrome; if(isChrome){ initMarqueeChrome(); console.log("isChrome: initMarqueeChrome"); }else{ initMarquee(); console.log("isChrome: initMarquee"); } });