How to preserve two decimal places in JavaScript

1. toFixed() method: This method converts a number to a string and retains the specified number of decimal places.

let num = 3.1415926; 
let result = num.toFixed(2); 
// "3.14" 

2. Math.round() method: This method rounds a number to a specified number of decimal places.

2. Math.round() 方法：该方法将数字四舍五入到指定的小数位数。

 3. parseFloat() and regular expressions: This methodconverts a string to a number and retains the specified number of decimal places.

let num = "3.1415926";
 let result = parseFloat(num).toFixed(2);
 // "3.14"

 4. Number() and regular expressions: This method converts a string into a number and retains the specified number of decimal places.

let num = "3.1415926";
 let result = Number(num.match(/^\d+(?:\.\d{0,2})?/));
 // 3.14

Readers can choose the methods provided above according to their needs. Your support is the driving force for my creation.