javascript 保留两位有效数字
来源:互联网 发布:java函数返回值为数组 编辑:程序博客网 时间:2024/04/30 19:34
<!DOCTYPE html><html> <head> <title>testDigit.html</title> <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"> <meta http-equiv="description" content="this is my page"> <meta http-equiv="content-type" content="text/html; charset=UTF-8"> <!--<link rel="stylesheet" type="text/css" href="./styles.css">--><script type="text/javascript"> function ForDight(Dight,How){ Dight = Math.round(Dight*Math.pow(10,How))/Math.pow(10,How); return Dight; } function f2(){ alert(ForDight(12345.67890,2));//保留三位小数 alert(ForDight(123.99999,2));//保留四位小数 } </script> </head> <body> <input type="button" value="四舍五入" onclick="f2()"/> </body></html>