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js implements the multiplication and division functions of two decimals

巴扎黑
巴扎黑Original
2016-12-06 10:12:142089browse

<!DOCTYPE html> 
<html> 
<head> 
<meta charset="UTF-8"> 
<title>jquery中的ajax</title> 
<script type="text/javascript" src="js/jquery-1.7.1.min.js"></script> 
<style type="text/css"> 
</style> 
<script type="text/javascript"> 
//计算两个数相乘 
function Mul(arg1, arg2){ 
var m=0,s1=arg1.toString(),s2=arg2.toString(); 
//获取两个相乘数据的小数点后面的数据的长度，即获取小数的位数，因为最终相乘计算的结果：结果小数的位数=第一个数的小数位数+第二个数的小数位数 
     try{ 
      m+=s1.split(".")[1].length; 
    }catch(e){} 
     try{ 
      m+=s2.split(".")[1].length; 
    }catch(e){} 
    //将两个小数去掉小数点，强制转换整个值（即进行数值放开小数点位数的倍数），然后进行相乘的操作，相乘的结果除去10的m次方 
     return Number(s1.replace(".",""))*Number(s2.replace(".",""))/Math.pow(10,m); 
} 
//计算两个数相除 
function  division(arg1, arg2){ 
var t1 = 0, t2 = 0, r1, r2; 
     try { 
      t1 = new String(arg1).split(".")[1].length; 
    } catch (e) { } 
     try { 
      t2 = arg2.toString().split(".")[1].length; 
    } catch (e) { } 
     r1 = Number(new String(arg1).replace(".", "")); 
     r2 = Number(arg2.toString().replace(".", "")); 
     //放大倍数后两个数相除 后，乘以两个小数位数长度相减后的10的次幂 
     var money = Mul((r1 / r2),Math.pow(10, t2 - t1)); 
     //保留2个小数位数 
     return money.toFixed(2); 
} 

$(function(){ 
alert(Mul(1.414,1.732)); 
alert(division(1.732,1.4146)); 
}); 
</script> 
</head> 
<body> 
</body> 
</html>


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