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Math.log10()

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since ⁨2015年7月⁩.

Math.log10() 静的メソッドは、数値の 10 を底とした対数を返します。すなわち次の値です。

\forall x > 0, 𝙼𝚊𝚝𝚑.𝚕𝚘𝚐𝟷𝟶 (𝚡) = {log}_{10} (x) = the unique y such that 10^{y} = x

試してみましょう

console.log(Math.log10(100000));
// 予想される結果: 5
console.log(Math.log10(2));
// 予想される結果: 0.3010299956639812
console.log(Math.log10(1));
// 予想される結果: 0
console.log(Math.log10(0));
// 予想される結果: -Infinity

構文

Math.log10(x)

引数

x: 0 以上の数値です。

Math.log10(-2); // NaN
Math.log10(-0); // -Infinity
Math.log10(0); // -Infinity
Math.log10(1); // 0
Math.log10(2); // 0.3010299956639812
Math.log10(100000); // 5
Math.log10(Infinity); // Infinity