
<script language="javascript"> document.write("<h1>JS保留两位小数例子</h1><br>"); var a=2.1512131231231321; document.write("原来的值:"+a+"<br>"); document.write("两位小数点:"+a.toFixed(2)+"<br>四位小数点"+a.toFixed(4)); </script>

Math.Round(45.367,2) //Returns 45.37 Math.Round(45.365,2) //Returns 45.36 C#中的Round()不是我们中国人理解的四舍五入,是老外的四舍五入,是符合IEEE标准的四舍五入,具体是四舍六入,下面的才是符合中国人理解的四舍五入 Math.Round(45.367,2,MidpointRounding.AwayFromZero);//45.37 Math.Round(45.365,2,MidpointRounding.AwayFromZero) //Returns 45.37