Comments (1)
我利用空余时间也写了一个:
function extendNumDoubles(n: number, timesNum: number): number {
let s = n.toString();
let index = s.indexOf('.');
if (index === -1)
return Number(s + '0'.repeat(timesNum));
else {
let strLen = s.length;
let numPointPos = index + 1 + timesNum;
let s2 =
s.slice(0, index) + //小数点前的数字
s.slice(index + 1, numPointPos) +//原小数点后和新小数点前的数字
(numPointPos <= strLen ? '.' : '') + //新小数点
s.slice(numPointPos) + //新小数点后的数字
(numPointPos - strLen > 0 ? '0'.repeat(numPointPos - strLen) : ''); //补零
return parseFloat(s2);
}
}
function toDecimalRound(x: number, digit: number): number {
digit = Math.abs(digit);
return Math.round(extendNumDoubles(Number(x.toPrecision(13)), digit)) / Math.pow(10, digit);
}
用了268ms的时间:
it('test Math toDecimalRound 268ms', () => {
let total = 0;
for (let i = 1; i <= 10000 * 10; i++) {
total += toDecimalRound(i,2);
}
console.log(total);
});
from number-precision.
Related Issues (20)
- times 计算问题 HOT 1
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- 计算时数量级超过475左右会报栈溢出
- 参数为字符串且末尾包含空格导致计算错误 HOT 3
- 能不能像jQuery那样链式操作呢 HOT 5
- 控制台warning HOT 2
- strip 不生效 HOT 3
- 能否打包时也打包打包.d.ts啊
- Multiplication issue HOT 1
- 增加除余操作
- Missing .d.ts file in packaged output, when using tsc in host program based ts 4.x may cause problem
- add操作字符串计算错误 HOT 1
- undefined/null校验
- why do this use precision = 15 as default value for strip function? HOT 1
- 怎么默认结果是保留两位小数的字符串?
- times Calculation error HOT 1
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from number-precision.