js 之 Number 工具类

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//只能输入整数function onlyInteger(obj) {var curVal = obj.value + '';if(curVal.length > 1) {var filterValue = obj.value.replace(/[^\d]/g,'').replace(/^0\d*$/g,'');if(obj.value != filterValue) {obj.value = filterValue;}} else {obj.value = obj.value.replace(/\D/g,'');}}//只能输入2位金额function onlyMoney(obj) {var curVal = obj.value + '';if(curVal.length > 1) {var filterValue = obj.value.replace(/^\D*(\d*(?:\.\d{0,2})?).*$/g, '$1').replace(/^0(\d{1,10}(?:\.\d{0,2})?)*$/g, '');if(obj.value != filterValue) {obj.value = filterValue;}} else {obj.value = obj.value.replace(/\D/g,'');}}//只能输入3位重量function onlyWeight(obj) {var curVal = obj.value + '';if(curVal.length > 1) {var filterValue = obj.value.replace(/^\D*(\d*(?:\.\d{0,3})?).*$/g, '$1').replace(/^0(\d{1,10}(?:\.\d{0,3})?)*$/g, '');if(obj.value != filterValue) {obj.value = filterValue;}} else {obj.value = obj.value.replace(/\D/g,'');}}//参数说明：num 要格式化的数字 n 保留小数位function formatMoney(num,n) {  if(num&&n){num=parseFloat(num);num=String(num.toFixed(n));var re=/(-?\d+)(\d{3})/;while(re.test(num)) num=num.replace(re,"$1,$2")return num; }else{return "0.00";}}//分转元function fToy(money) {return (parseFloat(money).div(100));}//元转分function yTof(money) {return (parseFloat(money).mul(100));}//除法函数，用来得到精确的除法结果//说明：javascript的除法结果会有误差，在两个浮点数相除的时候会比较明显。这个函数返回较为精确的除法结果。//调用：accDiv(arg1,arg2)//返回值：arg1除以arg2的精确结果function accDiv(arg1,arg2){var t1=0,t2=0,r1,r2;try{t1=arg1.toString().split(".")[1].length}catch(e){}try{t2=arg2.toString().split(".")[1].length}catch(e){}with(Math){r1=Number(arg1.toString().replace(".",""))r2=Number(arg2.toString().replace(".",""))return (r1/r2)*pow(10,t2-t1);}}//给Number类型增加一个div方法，调用起来更加方便。Number.prototype.div = function (arg){return accDiv(this, arg);}//乘法函数，用来得到精确的乘法结果//说明：javascript的乘法结果会有误差，在两个浮点数相乘的时候会比较明显。这个函数返回较为精确的乘法结果。//调用：accMul(arg1,arg2)//返回值：arg1乘以 arg2的精确结果function accMul(arg1,arg2){var m=0,s1=arg1.toString(),s2=arg2.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)}// 给Number类型增加一个mul方法，调用起来更加方便。Number.prototype.mul = function (arg){return accMul(arg, this);}function accDiv(arg1, arg2) {var t1 = 0, t2 = 0, r1, r2;try { t1 = arg1.toString().split(".")[1].length } catch (e) { }try { t2 = arg2.toString().split(".")[1].length } catch (e) { }with (Math) {r1 = Number(arg1.toString().replace(".", ""))r2 = Number(arg2.toString().replace(".", ""))return (r1 / r2) * pow(10, t2 - t1);}}//给Number类型增加一个div方法，调用起来更加方便。Number.prototype.div = function(arg) {return accDiv(this, arg);}function accMul(arg1, arg2) {var m = 0, s1 = arg1.toString(), s2 = arg2.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)}Number.prototype.mul = function(arg) {return accMul(arg, this);}function accAdd(arg1, arg2) {var r1, r2, m, c;try { r1 = arg1.toString().split(".")[1].length } catch (e) { r1 = 0 }try { r2 = arg2.toString().split(".")[1].length } catch (e) { r2 = 0 }c = Math.abs(r1 - r2);m = Math.pow(10, Math.max(r1, r2))if (c > 0) {var cm = Math.pow(10, c);if (r1 > r2) {arg1 = Number(arg1.toString().replace(".", ""));arg2 = Number(arg2.toString().replace(".", "")) * cm;} else {arg1 = Number(arg1.toString().replace(".", "")) * cm;arg2 = Number(arg2.toString().replace(".", ""));}} else {arg1 = Number(arg1.toString().replace(".", ""));arg2 = Number(arg2.toString().replace(".", ""));}return (arg1 + arg2) / m}Number.prototype.add = function(arg) {return accAdd(arg, this);}//排序方法function compareInt(x, y){    var iNum1 = parseInt(x[0]);//强制转换成int型;    var iNum2 = parseInt(y[0]);    if(iNum1 < iNum2){        return -1;    }else if(iNum1 > iNum2){        return 1;    }else{        return 0;    }}

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