问题描述
如果我问你,4330.61乘以100等于多少,我猜你肯定跟我说:“肯定是 433061”啊!
是啊,要我我也是这么回答,来来来我们来看看浏览器怎么说吧,如下图
偌!浏览器告诉我,他就是算不对,这要是给客户算钱,客户不就有意见了....
WHY?计算机计算出来的还不如我自己的心算呢!!!!
如果你想了解什么原因,您请看=>js浮点数精度问题的前世今生?
解决办法
;(function(){
function mathService(){
this.add=function(a,b){
var c, d, e;
try {
c = a.toString().split(".")[1].length;
} catch (f) {
c = 0;
}
try {
d = b.toString().split(".")[1].length;
} catch (f) {
d = 0;
}
return e = Math.pow(10, Math.max(c, d)), (this.mul(a, e) + this.mul(b, e)) / e;
}
this.mul=function(a, b) {
var c = 0,
d = a.toString(),
e = b.toString();
try {
c += d.split(".")[1].length;
} catch (f) {}
try {
c += e.split(".")[1].length;
} catch (f) {}
return Number(d.replace(".", "")) * Number(e.replace(".", "")) / Math.pow(10, c);
}
this.sub=function(a,b){
var c, d, e;
try {
c = a.toString().split(".")[1].length;
} catch (f) {
c = 0;
}
try {
d = b.toString().split(".")[1].length;
} catch (f) {
d = 0;
}
return e = Math.pow(10, Math.max(c, d)), (this.mul(a, e) - this.mul(b, e)) / e;
}
this.div=function(a, b) {
var c, d, e = 0,
f = 0;
try {
e = a.toString().split(".")[1].length;
} catch (g) {}
try {
f = b.toString().split(".")[1].length;
} catch (g) {}
return c = Number(a.toString().replace(".", "")), d = Number(b.toString().replace(".", "")), this.mul(c / d, Math.pow(10, f - e));
}
}
window.mathService=new mathService()
})(window);
来来来,用起来
Ok!写完收工!!!