代码如下，复制即可使用：
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title>JQ实现弹幕效果</title>
<style type="text/css">
*{
padding: 0;
margin: 0;
}
#box{
height:700px;
width:1000px;
margin: 0 auto;
border:1px solid #000000;
position: relative;
}
#main{
width:100%;
height:605px;
position: relative;
overflow: hidden;
}
p{
position: absolute;
left:1000px;
width:200px;
top:0;
}
#bottom{
width:100%;
height:80px;
background: #ABCDEF;
text-align: center;
padding-top: 15px;
position: absolute;
left: 0;
bottom: 0;
}
#txt{
width:300px;
height:50px;
}
#btn{
width:100px;
height:50px;
}
</style>
</head>
<body>
<div id="box">
<div id="main">
</div>
<div id="bottom">
<input type="text" id="txt" placeholder="请输入内容" />
<input type="button" id="btn" value="发射" />
</div>
</div>
<script src="http://libs.baidu.com/jquery/1.9.1/jquery.js"></script>
<script type="text/javascript">
$(function(){
var pageH=parseInt($("#main").height());
var colorArr=["#cfaf12","#12af01","#981234","#adefsa","#db6be4","#f5264c","#d34a74"];
$("#btn").bind("click",auto);
document.onkeydown=function(e){
if(e.keyCode == 13){
auto();
}
};
function auto(){
var $value = $("#txt").val();
$("#main").append("<p>" + $value + "</p>");
$("#txt").val("");
var _top=parseInt(pageH*(Math.random()));
var num=parseInt(colorArr.length*(Math.random()));
$("p:last-child").css({"top":_top,"color":colorArr[num],"font-size":"20px"});
$("p:last-child").animate({"left":"-200px"},10000);
$("p:last-child").stop().animate({"left":"-300px"},10000,"linear",function(){
$(this).remove();
});
//console.log($value);
};
})
</script>
</body>
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