How does the front-end efficiently handle double-precision floating-point numbers returned by the back-end?

Front-end JavaScript handles the accuracy problem of back-end double-precision floating-point numbers

Backend systems often return double-precision floating-point numbers, but using these data directly in front-end JavaScript environments is prone to accuracy loss or display exceptions. This is because JavaScript's Number type follows the IEEE 754 standard and has a precision limit when denominating certain decimal numbers. This article discusses solutions that are better than the background to string and front-end toFixed() method.

Although the toFixed() method can solve some display problems, it uses the banker rounding method, which may lead to accumulated accuracy errors.

More effective solutions:

1. Use big.js library: big.js library is specially used to deal with high-precision floating-point numbers, avoiding the accuracy of JavaScript native Number type, and ensuring accurate calculation results. It supports precise floating-point number addition, subtraction, multiplication and division operations, and outputs results in string form to prevent accuracy loss.

2. Data amplification processing: For scenarios with extremely high accuracy requirements, such as amount calculation, data amplification processing can be performed. For example, the amount data of the two decimal places is enlarged by 100 times and stored as an integer, perform integer calculations, and finally reduce by 100 times and display. This can effectively avoid the accuracy loss caused by floating-point number operations.

3. Combination of BigInt and big.js: If you need to deal with large numbers that exceed the scope of JavaScript's native Number type representation, you can use the BigInt type to combine the big.js library. BigInt can represent any large integer, and combined with the zoom-in and reduction processing, it can solve the problems of large number operation overflow and accuracy. This is especially effective when dealing with high-precision and potentially large data values ​​(such as amounts).

Which method to choose depends on the specific application scenario and accuracy requirements. For simple display problems, toFixed() may be sufficient; but for scenarios where large numbers need to be accurately calculated or processed, big.js library or BigInt combined with zoom-in and zoom-out processing is a more reliable choice.

The above is the detailed content of How does the front-end efficiently handle double-precision floating-point numbers returned by the back-end?. For more information, please follow other related articles on the PHP Chinese website!