var CMX = CMX || {};
/**
** 加
**/
CMX.add = function (arg1, arg2) {
if(arg1 == undefined && arg2 == undefined)return 0;
if(arg1 == undefined)arg1 = 0;
if(arg2 == undefined)arg2 = 0;
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;
};
/**
** 减
**/
CMX.sub = function (arg1, arg2) {
if(arg1 == undefined && arg2 == undefined)return 0;
if(arg1 == undefined)arg1 = 0;
if(arg2 == undefined)arg2 = 0;
var r1, r2, m, n;
try {
r1 = arg1.toString().split(".")[1].length;
}
catch (e) {
r1 = 0;
}
try {
r2 = arg2.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 Number(((arg1 * m - arg2 * m) / m).toFixed(n));
};
/**
** 乘
**/
CMX.mul = function (arg1, arg2) {
if(arg1 == undefined || arg2 == undefined)return 0;
var m = 0, s1 = arg1.toString(), s2 = arg2.toString();
try {
m += s1.split(".")[1].length;
m += s2.split(".")[1].length;
} catch (e) {}
return Number(s1.replace(".", "")) * Number(s2.replace(".", "")) / Math.pow(10, m);
};
/**
** 除
**/
CMX.div = function (arg1, arg2) {
if(arg1 == undefined || arg2 == "" || arg2 == undefined || arg2 == 0)return 0;
var t1 = 0, t2 = 0, r1, r2;
try {
t1 = arg1.toString().split(".")[1].length;
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);
}
};
var CMX = CMX || {};
/**
** 加
**/
CMX.add = fun
阅读背景：
js加减乘除丢失经度问题
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