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August 29, 2015 14:03
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数字运算
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//加法 | |
Number.prototype.add = function(arg){ | |
var r1,r2,m,n; | |
try{r1 = this.toString().split(".")[1].length}catch(e){r1=0} | |
try{r2 = arg.toString().split(".")[1].length}catch(e){r2=0} | |
m=Math.pow(10,Math.max(r1,r2)); | |
n=(r1>=r2)?r1:r2; | |
return ((this*m+arg*m)/m).toFixed(n); | |
} | |
//减法 | |
Number.prototype.sub = function (arg){ | |
var r1,r2,m,n; | |
try{r1=this.toString().split(".")[1].length}catch(e){r1=0} | |
try{r2=arg.toString().split(".")[1].length}catch(e){r2=0} | |
m=Math.pow(10,Math.max(r1,r2)); | |
n=(r1>=r2)?r1:r2; | |
return ((this*m-arg*m)/m).toFixed(n); | |
} | |
//乘法 | |
Number.prototype.mul = function (arg) | |
{ | |
var m=0,s1=this.toString(),s2=arg.toString(); | |
try{m+=s1.split(".")[1].length}catch(e){} | |
try{m+=s2.split(".")[1].length}catch(e){} | |
return Number(s1.replace(".",""))*Number(s2.replace(".",""))/Math.pow(10,m) | |
} | |
//除法 | |
Number.prototype.div = function (arg){ | |
var t1=0,t2=0,r1,r2; | |
try{t1=this.toString().split(".")[1].length}catch(e){} | |
try{t2=arg.toString().split(".")[1].length}catch(e){} | |
with(Math){ | |
r1=Number(this.toString().replace(".","")) | |
r2=Number(arg.toString().replace(".","")) | |
return (r1/r2)*pow(10,t2-t1); | |
} | |
} |
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