23 lines
923 B
TypeScript
23 lines
923 B
TypeScript
// 这是基础的示例代码
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// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/floor
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// MDN上的示例代码是公共领域或CC0(您的偏好)或MIT，具体取决于示例代码添加的时间:
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// https://developer.mozilla.org/en-US/docs/MDN/About
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export default (value: number | string[], exp?:number | undefined) => {
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// 如果exp没有定义或者为零...
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if (typeof exp === 'undefined' || +exp === 0) {
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return Math.round(value as number)
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}
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value = +value
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exp = +exp
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// 如果值不是数字或exp不是整数…
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if (isNaN(value) || !(exp % 1 === 0)) {
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return NaN
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}
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// Shift
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value = value.toString().split('e')
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value = Math.round(+(value[0] + 'e' + (value[1] ? (+value[1] - exp) : -exp)))
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// Shift back
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value = value.toString().split('e')
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return +(value[0] + 'e' + (value[1] ? (+value[1] + exp) : exp))
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} |