jq跑马灯效果
这几天公司产品有个无缝循环滚动的广告跑马灯要做，最开始想到的是<marquee>标签，但在PC端正常，在安卓广告屏上却怎么都跑不动，后来用的css3的animation，结果也是PC端及其他一些手机正常，但一到安卓广告屏上就跑不动了；后来领导找了个jQuery插件，经测试，完美运行。
<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>滚动文字jquery插件</title>
/**
* author ormin
* http://www.cnblogs.com/kangaoxiaoshi/p/5431870.html
* http://www.cnblogs.com/yexiaochai/p/3759959.html
* http://www.cnblogs.com/axl234/p/5780432.html
*/
<script src="http://libs.baidu.com/jquery/1.6.4/jquery.min.js"></script>
<script type="text/javascript">
(function($) {
$.fn.extend({
roll: function(options) {
var defaults = {
speed:1
};
var options = $.extend(defaults, options);
var speed=(document.all) ? options.speed : Math.max(1,options.speed-1);
if ($(this) == null) return ;
var $container = $(this);
var $content = $("#content");
var init_left = $container.width();
$content.css({left:parseInt(init_left) + "px"});
var This = this;
var time = setInterval(function(){This.move($container,$content,speed);},20); //setInterval会改变this指向，即使加了This=this，也要用匿名函数封装，这里调试了n久
$container.bind("mouseover",function()
{
clearInterval(time);
});
$container.bind("mouseout",function()
{
time = setInterval(function(){This.move($container,$content,speed);},20);
});
return this;
},
move:function($container,$content,speed){
var container_width = $container.width();
var content_width = $content.width();
if (parseInt($content.css("left")) + content_width > 0)
{
$content.css({left:parseInt($content.css("left")) - speed + "px"});
}
else
{
$content.css({left:parseInt(container_width) + "px"});
}
}
});
})(jQuery);
//插件的调用$("#yourId").roll({speed:#yourSpeed});
$(document).ready(
function(){
$("#container").roll({speed:8});
}
);
</script>
<style type="text/css">
#container{
background:#CCCCCC;
position:relative;
overflow:hidden; /*这个东西折腾了很久才弄出来*/
width:550px;
height:80px;
line-height:80px;
margin:100px;
}
#content{
position:absolute;
left:0;
top:0;
white-space:nowrap; /*重要，不然文字显示效果不好*/
}
</style>
</head>
<body>
<div id="container">
<div id="content" style="color:red;font-size:80px;">This is a roll word test,created by Baidu FE.</div>
</div>
</body>
</html>
jQuery部分（使用时先引用jQuery插件）
(function($) {
$.fn.extend({
roll: function(options) {
var defaults = {
speed:1
};
var options = $.extend(defaults, options);
var speed=(document.all) ? options.speed : Math.max(1,options.speed-1);
if ($(this) == null) return ;
var $container = $(this);
var $content = $("#content");
var init_left = $container.width();
$content.css({left:parseInt(init_left) + "px"});
var This = this;
var time = setInterval(function(){This.move($container,$content,speed);},20); //setInterval会改变this指向，即使加了This=this，也要用匿名函数封装，这里调试了n久
$container.bind("mouseover",function()
{
clearInterval(time);
});
$container.bind("mouseout",function()
{
time = setInterval(function(){This.move($container,$content,speed);},20);
});
return this;
},
move:function($container,$content,speed){
var container_width = $container.width();
var content_width = $content.width();
if (parseInt($content.css("left")) + content_width > 0)
{
$content.css({left:parseInt($content.css("left")) - speed + "px"});
}
else
{
$content.css({left:parseInt(container_width) + "px"});
}
}
});
})(jQuery);
