1.加法
Number.prototype.add = function (arg) {
var r1, r2, m;
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))
return (this.mul(m) + arg.mul(m)).div(m)
}
2.减法
//减法
Number.prototype.sub = function (arg) {
return this.add(-arg);
}
3.乘法
//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)
}
4.除法
//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) {
}
r1 = Number(this.toString().replace(".", ""))
r2 = Number(arg.toString().replace(".", ""))
return (r1/r2).mul(Math.pow(10, t2 - t1));
}
直接挂载到原型上使用就可以了
