javascript实现弹幕效果代码

2016-05-27 网页编程网 网页编程网

<!DOCTYPE HTML><html><head><title>javascript弹幕</title><meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<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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