<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<title>javascript弹幕</title>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<style>
#play{
width:600px;
height:500px;
background-color:#000;
}
#tangmu{
width:600px;
height:500px;
background-color:#fff;
z-index:9999;
background-color: rgba(000, 1, 000, 0.1);
}
#textStyle{
position:absolute;
font-size:24px;
color:#fff;
}
</style>
</head>
<body>
<div id="play">
<div id="tangmu">
</div>
</div>
<input type="text" id="text" value="这是弹幕..."/><input type="button" value="发送" onClick="tangmu();"/>
<script>
var si;
function tangmu(){
clearInterval(si);
var text = document.getElementById("text");
var tangmu = document.getElementById("tangmu");
var textStyle="<font id=\"textStyle\">"+text.value+"</font>";
mathHeight = Math.round(Math.random()*tangmu.offsetHeight)+"px";
var textLeft=tangmu.offsetWidth+"px";
tangmu.innerHTML=textStyle;
var textStyleObj = document.getElementById("textStyle");
textStyleObj.style.left=textLeft;
textStyleObj.style.top=mathHeight;
var x=parseInt(textStyleObj.style.left);
si = setInterval("xunhuan("+x+")",100);
}
function xunhuan(left){
var textStyleObj = document.getElementById("textStyle");
textStyleObj.style.left=left;
var x=parseInt(textStyleObj.style.left);
if(x<textStyleObj.style.width){
document.getElementById("tangmu").innerHTML="";
clearInterval(si);
}else{
x-=18;
}
textStyleObj.style.left=x+"px";
}
</script>
</body>
</html>
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