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Showing content from https://developer.mozilla.org/zh-TW/docs/Web/JavaScript/Reference/Global_Objects/Number/toFixed below:

Number.prototype.toFixed() - JavaScript | MDN

Baseline Widely available

toFixed() 方法會使用定點小數表示法（fixed-point notation）來格式化數字。

function financial(x) {
  return Number.parseFloat(x).toFixed(2);
}

console.log(financial(123.456));
// Expected output: "123.46"

console.log(financial(0.004));
// Expected output: "0.00"

console.log(financial("1.23e+5"));
// Expected output: "123000.00"

digits 小數位

選擇性輸入。顯示數值至多少個小數點，範圍由 0 到 20 之間，執行時或可支援非常大範圍的數值。如果無輸入會默認做 0。

一個代表以定點小數表示法（fixed-point notation）格式化數字後的字串。

RangeError

If digits is too small or too large. Values between 0 and 100, inclusive, will not cause a RangeError. Implementations are allowed to support larger and smaller values as chosen.

TypeError

If this method is invoked on an object that is not a Number.

toFixed() returns a string representation of numObj that does not use exponential notation and has exactly digits digits after the decimal place. The number is rounded if necessary, and the fractional part is padded with zeros if necessary so that it has the specified length. If numObj is greater than 1e+21, this method simply calls Number.prototype.toString() and returns a string in exponential notation.

var numObj = 12345.6789;

numObj.toFixed(); // Returns '12346': note rounding, no fractional part
numObj.toFixed(1); // Returns '12345.7': note rounding
numObj.toFixed(6); // Returns '12345.678900': note added zeros
(1.23e20).toFixed(2); // Returns '123000000000000000000.00'
(1.23e-10).toFixed(2); // Returns '0.00'
(2.34).toFixed(1); // Returns '2.3'
(2.35).toFixed(1); // Returns '2.4'. Note that it rounds up in this case.
-(2.34).toFixed(1); // Returns -2.3 (due to operator precedence, negative number literals don't return a string...)
(-2.34).toFixed(1); // Returns '-2.3' (...unless you use parentheses)

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