JavaScript | Math.log()方法 (JavaScript | Math.log() Method)

Math.log() is a function in math library of JavaScript that is used to return the value of natural Log i.e. (base e) of the given number. It is also known as ln(x) in mathematical terms.

Math.log()是JavaScript數學庫中的函數，用于返回給定數字的自然Log值(即e的底數 )。 它在數學上也稱為ln(x) 。

Syntax:

句法：

    Math.log(value);

Parameter(s):

參數：

• value – It represents the value for which natural log is to be found.

  值 –它表示要找到自然對數的值。

Return value:

返回值：

The return type of this method is number, it returns a number value which is log_e(value).

此方法的返回類型為number ，它返回一個數字值log _e (值) 。

Values accepted: Integer, floating-point, numeric string.

接受的值：整數，浮點數，數字字符串。

Invalid Values: non-numeric string, empty variable, empty array all will return NaN (Not a Number).

無效值：非數字字符串，空變量，空數組都將返回NaN(非數字)。

Browser support: Chrome, Internet asinlorer, Mozilla, Safari, Opera mini.

瀏覽器支持： Chrome，Internet代理，Mozilla，Safari，Opera mini。

Example 1: Valid values

示例1：有效值

console.log(Math.log(5));
console.log(Math.log(3.14));
console.log(Math.log(0));
console.log(Math.log("0.65"));

Output

輸出量

1.6094379124341003
1.144222799920162
-Infinity
-0.4307829160924542

Example 2: Invalid values

示例2：無效值

console.log(Math.log("Javascript"));
console.log(Math.log(-1));

Output

輸出量

NaN
NaN

翻譯自: https://www.includehelp.com/code-snippets/math-log-method-with-example-in-javascript.aspx