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Example code for random roll call in html seating chart
- 高洛峰Original
- 2017-03-24 12:01:219300browse
This article explains in detail the example code of random roll call in html seating chart
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>点名</title>
<style>
td {
width: 9.09%;
height: 50px;
text-align: center;
}
.tdBg {
background-color: pink;
}
</style>
<script>
var timer = null;
// 这是一个函数，表示一个功能
function start(){
timer = setInterval(function(){
// alert("要开始了！");
// console.log("???");
// 1.找到所有的 单元格
var allTd = document.getElementsByTagName("td");
// 3.获取一个随机数
// Math.random() 获取一个0-1的小数
// Math.random()*42 获取0-42中间的小数
// parseInt()把一个数字变成整数，例：parseInt(55.99999) ====== 55
var num = parseInt(Math.random()*42);
// 2.遍历所有单元格，将所有单元格加上背景颜色
for (var i=0; i<allTd.length; i++) {
// 如果（xxxxx） {
// 1
// } 否则 {
// 2
// }
if (i == num) {
allTd[i].className = "tdBg";
} else {
allTd[i].className = "";
}
}
}, 1);
}
function end(){
clearInterval(timer);
}
</script>
</head>
<body>
<!-- table是表格标签，tr表示一行，td表示一行中的一个单元格 -->
<!-- 默认情况，单元格会根据内容的长度比例来自动设置 -->
<table border="1" width="1000">
<tr>
<!-- 可以对单元格施加宽度属性，使用百分比和长度皆可 -->
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td rowspan="4">走<br>廊</td>
<td>钱华</td>
<td>康娜娜</td>
<td>黄奕渊</td>
<td>马庆元</td>
<td></td>
</tr>
<tr>
<td>刘杰</td>
<td>魏培芳</td>
<td>程鹏</td>
<td>王可可</td>
<td>曹敬</td>
<td>朱明洋</td>
<td>毛岗</td>
<td>王博</td>
<td>张国庆</td>
<td>潘世豪</td>
</tr>
<tr>
<td>黄倩倩</td>
<td>张凯</td>
<td>张坤</td>
<td>唐东权</td>
<td>范东东</td>
<td>夏思泽</td>
<td>于号山</td>
<td>熊仁龙</td>
<td>夏利敏</td>
<td>史一良</td>
</tr>
<tr>
<td></td>
<td>陈兰</td>
<td>刘攀登</td>
<td>袁翔</td>
<td>李鑫</td>
<td></td>
<td>谢华强</td>
<td>焦浩</td>
<td>李亚丹</td>
<td>韩婷婷</td>
</tr>
<tr>
<!-- colspan 可以跨列 -->
<td colspan="11">Poppei</td>
</tr>
</table>
<br><br>
<input type="button" value="开始" onclick="start()">
<input type="button" value="结束" onclick="end()">
</body>
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