Introduction to the use of replace method in js_javascript skills

The replace() method is used to replace some characters with other characters in a string, or replace a substring that matches a regular expression.

It should be noted that: If regexp has the global flag g when replacing with a regular expression, then the replace() method will replace all matching substrings. Otherwise, it only replaces the first matching substring.

The following is a simple example:

Copy the code The code is as follows:

//As a result, it only replaces the first letter. But if you add a regular expression, the result will be different! replace() supports regular expressions, it can match characters or strings according to the rules of regular expressions, and then replace them!

//But the result is still unchanged, it will be OK with a little modification.