js实现随机点名器的思路
利用setTimeout()计时器实现随机的效果，功能函数
function show(){
var box=window.document.getElementById("box");
var num=Math.floor((Math.random()*100000))%namelist.length;
box.innerHTML=namelist[num];
mytime=setTimeout("show()",1);
}
完整代码如下：
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>点击按钮随机点名-样式布局参考</title>
<style type="text/css">
#box {
margin: auto;
width: 660px;
font-size: 66px;
height: 94px;
color: #138eee;
text-align: center;
margin-top: 200px;
}
#bt {
margin: auto;
width: 200px;
text-align: center;
margin-top: 75px;
color: #fff;
font-size: 25px;
cursor: pointer;
}
</style>
<script type="text/javascript">
var namelist=["张三","李四","王五","赵六","孙七"];
var mytime=null;
function doit(){
var bt=window.document.getElementById("bt");
if(mytime==null){
bt.innerHTML="停止";
show();
}
else{
bt.innerHTML="开始点名";
clearTimeout(mytime);
mytime=null;
}
}
function show(){
var box=window.document.getElementById("box");
var num=Math.floor((Math.random()*100000))%namelist.length;
box.innerHTML=namelist[num];
mytime=setTimeout("show()",1);
}
</script>
</head>
<body id="bodybj" style="background-color: black;">
<div id="box">亲，准备好点名了吗？</div>
<div id="bt" onclick="doit()">开始点名</div>
</body>
</html>
