jquery数值精度计算

 ????????/** ????????*判断数值是否相等 ????????* @param source 原比较数据 ????????* @param target 目标比较数据 ????????* @param accuracy 精度值 ????????* @returns {boolean} ????????*/ ???????isEqual:function(source,target,accuracy){ ???????????accuracy = accuracy == undefined ? 10:accuracy; //默认精度位10 ???????????return parseFloat(source).toFixed(accuracy) === ?parseFloat(target).toFixed(accuracy); ???????} ???????/** ????????*数值相加 ????????* @param firstNumber ????????* @param lastNumber ????????* @returns {number} ????????*/ ???????accuracyAdd:function(firstNumber,lastNumber){ ???????????var num1,num2,m; ???????????try{num1=firstNumber.toString().split(".")[1].length}catch(e){num1=0}; ???????????try{num2=lastNumber.toString().split(".")[1].length}catch(e){num2=0}; ???????????m=Math.pow(10,Math.max(num1,num2)); ???????????return (firstNumber*m+lastNumber*m)/m; ???????} ???????/** ????????* 数值相减 ????????* @param firstNumber ????????* @param lastNumber ????????* @returns {string} ????????*/ ???????accuracySub:function(firstNumber,lastNumber){ ???????var r1,r2,m,n; ???????try{r1=firstNumber.toString().split(".")[1].length}catch(e){r1=0} ???????try{r2=lastNumber.toString().split(".")[1].length}catch(e){r2=0} ???????m=Math.pow(10,Math.max(r1,r2)); ???????//last modify by deeka ???????//动态控制精度长度 ???????n=(r1>=r2)?r1:r2; ???????return ((firstNumber*m-lastNumber*m)/m).toFixed(n); ???} ???????/** ????????* 除法函数，两数相除 ????????* @param arg1 ????????* @param arg2 ????????* @returns {number} ????????*/ ???????accuracyDiv:function(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); ???????} ???} ???????/** ????????* 乘法函数,两数相乘 ????????* @param arg1 ????????* @param arg2 ????????* @returns {number} ????????*/ ???????accuracyMul:function(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)　　　　}