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This article mainly explains "es6 how to replace the first character of a string with other characters". The content of the explanation is simple and clear, and it is easy to learn and understand. Please follow the editor's train of thought to study and learn "es6 how to replace the first character of a string with other characters".

Replacement method: 1, use charAt () to get and return the first character in the string, syntax "string object .charat (0)"; 2, use replace () to replace the first character acquired with other characters, syntax "string object .replace (first character value," new character ")".

The operating environment of this tutorial: windows7 system, ECMAScript version 6, Dell G3 computer.

Es6's method of replacing the first character of a string with another character

1. Use charAt () to get the first character in the string

The charAt () method returns the characters at the specified position. Syntax:

StringObject.charAt (index)

Index is required. A number that represents a position in a string, that is, the subscript of a character in a string.

The subscript of the first character in the string is 0. If the parameter index is not between 0 and string.length, the method returns an empty string.

Var str= "t679njhsimmkh"; var zf=str.charAt (0); console.log (str); console.log (zf)

2. Replace the first character acquired with replace ()

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

Str.replace (zf, "CBA")

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