简单版点名

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>点名开始了</title>
    <style>
        .bd{
            position: relative;
            background-color: lightskyblue;
        }
        #btn{
            position: absolute;
            right: 100px;
            top: 300px;
            background-color: lightskyblue;
        }
        #btn div{
                     width: 150px;
                     height: 80px;
                 }
         #btn div input{
             font-size: 30px;
             width: 100px;
             height: 50px;
         }
        .table{
            position: absolute;
            left: 300px;
            top: 180px;
        }
        .table tr{
            height: 50px;
            line-height: 50px;
        }
        .table tr td{
            font-size: 30px;
            padding: 20px;
        }
        .current{
            background: url("images/5.jpg");
            background-size: cover;
        }
    </style>
</head>
<body class="bd">
<div id="btn">
    <div><input type="button" id="btn1" value="点一个人"/></div>
    <div><input type="button" id="btn2" value="点两个人"/></div>
    <div><input type="button" id="btn3" value="点三个人"/></div>
</div>
<div class="table">
    <table id="form">
        <tr>
            <td class="current">张三</td>
            <td>张三</td>
            <td>张三</td>
            <td>张三</td>
            <td>张三</td>
            <td>张三</td>
            <td>张三</td>
        </tr>
        <tr>
            <td>里奥</td>
            <td>里奥</td>
            <td>里奥</td>
            <td>里奥</td>
            <td>里奥</td>
            <td>里奥</td>
            <td>里奥</td>
        </tr>
        <tr>
            <td>哈哈</td>
            <td>哈哈</td>
            <td>哈哈</td>
            <td>哈哈</td>
            <td>哈哈</td>
            <td>哈哈</td>
            <td>哈哈</td>
        </tr>
        <tr>
            <td>嘿嘿</td>
            <td>嘿嘿</td>
            <td>嘿嘿</td>
            <td>嘿嘿</td>
            <td>嘿嘿</td>
            <td>嘿嘿</td>
            <td>嘿嘿</td>
        </tr>
        <tr>
            <td>埃尼</td>
            <td>埃尼</td>
            <td>埃尼</td>
            <td>埃尼</td>
            <td>埃尼</td>
            <td>埃尼</td>
            <td>埃尼</td>
        </tr>
    </table>
</div>
<script>
var tb=document.getElementById("form");
var td=document.getElementsByTagName("td");
var btn1=document.getElementById("btn1");
var btn2=document.getElementById("btn2");
var btn3=document.getElementById("btn3");
for(var i=0;i<td.length;i++){
    td[i].setAttribute("index",i);
    td[i].getAttribute("index");
}
btn1.onclick=function () {
    for(var i=0;i<td.length;i++){
        td[i].className="";
    }
    td[index=parseInt(Math.random()*34)].className="current";
}
btn2.onclick=function () {
    for(var i=0;i<td.length;i++){
        td[i].className="";
    }
    td[index=parseInt(Math.random()*34)].className="current";
    td[index=parseInt(Math.random()*34)].className="current";
}
btn3.onclick=function () {
    for(var i=0;i<td.length;i++){
        td[i].className="";
    }
    td[index=parseInt(Math.random()*34)].className="current";
    td[index=parseInt(Math.random()*34)].className="current";
    td[index=parseInt(Math.random()*34)].className="current";
}
</script>
</body>
</html>
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