Explanation of the problem that JavaScript strict mode does not support octal

Regarding the issue that JavaScript strict mode does not support octal, first of all, we all know that JavaScript can express octal by adding 0 in front of the number.

as follows:

let i = 011;
console.log(i); // 9

But in strict mode, this approach breaks down:

"use strict";
let i = 011; // Uncaught SyntaxError: Octal literals are not allowed in strict mode.
console.log(i);

This means that octal is not supported in strict mode.

If you must use it, you can use a roundabout way to save the country:

Set the octal data as a string, then convert it through parseInt , and set the conversion base to octal.

"use strict";
let i = '011';
console.log(parseInt(i, 8)); // 9

This concludes the article on the issue of JavaScript strict mode not supporting octal. For more information on JavaScript strict mode, please search previous articles on 123WORDPRESS.COM or continue browsing the following related articles. I hope you will support 123WORDPRESS.COM in the future!