1 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
2 <html xmlns="http://www.w3.org/1999/xhtml">
3 <head>
4 <meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
5 <title>Math对象的方法
</title>
6 <script type="text/javascript">
7 window.onload=function(){
8 var str=Math.ceil(25.1)+"<br/>"; //上舍入,由小数点就进1
9 str+=Math.floor(26.5)+"<br/>"; //对数进行下舍入,由小数点就省略
10 str+=Math.round(25.5)+"<br/>"; //四舍五入
11 str+=Math.random()+"<br/>"; //随机数,0-1不包含0和1
12 document.getElementsByTagName("div")[0].innerHTML=str;
13 }
14 </script>
15 </head>
16 <body>
17 <div></div>
18 </body>
19 </html>
转载于:https://www.cnblogs.com/holly8/p/5783389.html
