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                [TOC] > Tue May 25 2021 12:03:14 GMT+0800 (GMT+08:00) JavaScript 在數學計算方面計算精度有限,**不可用于高精確度數學計算**。很多 Math 函數都有一個精度,而且這個精度在不同實現中也是不相同的。這意味著不同的瀏覽器會給出不同的結果,甚至,在不同的系統或架構下,相同的 JS 引擎也會給出不同的結果! 換言之,就算你打算開發一個計算器都不應該使用 JavaScript 作為計算核心……但是你可以拿它來設計計算器的界面。 Math 的所有屬性與方法都是靜態的。不能像這樣使用:` new Math()` 我就不搬運了,大家自行前往學習 https://developer.mozilla.org/zh-CN/docs/Web/JavaScript/Reference/Global_Objects/Math ## 方法 我們直接用一個宏過一遍算了: > 偷懶了,感興趣的可自行查看具體方法的參數。 ```js function _m_show_mathMethods() { let pi = Math.PI let forEvals = [ "Math.abs(pi)", "Math.acos(pi)", "Math.acosh(pi)", "Math.asin(pi)", "Math.asinh(pi)", "Math.atan(pi)", "Math.atan2(pi)", "Math.atanh(pi)", "Math.cbrt(pi)", "Math.ceil(pi)", "Math.clz32(pi)", "Math.cos(pi)", "Math.cosh(pi)", "Math.exp(pi)", //"Math.expM1(pi)", "Math.floor(pi)", "Math.fround(pi)", "Math.hypot(pi)", "Math.imul(pi)", "Math.log(pi)", "Math.log10(pi)", "Math.log1p(pi)", "Math.log2(pi)", "Math.max(pi)", "Math.min(pi)", "Math.pow(pi,2)", "Math.random(pi)", "Math.round(pi)", "Math.sign(pi)", "Math.sin(pi)", "Math.sinh(pi)", "Math.sqrt(pi)", "Math.tan(pi)", "Math.tanh(pi)", "Math.trunc(pi)" ]; // header Range("A1").Value2 = "Math方法"; Range("B1").Value2 = "計算結果"; for (let i = 0; i < forEvals.length; i++) { let writeHere = Range("A2").Offset(i, 0) writeHere.Value2 = forEvals[i]; writeHere.Offset(0, 1).Value2 = eval(forEvals[i]) } } ```
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