How to replace characters in a javascript string-JS Tutorial-php.cn

In JavaScript, you can use the replace() method of the String object to replace characters in the string. The syntax is "str.replace("String to be replaced", "New String")" or " str.replace(/String to be replaced/g, "new string")".

How to replace characters in a javascript string

The operating environment of this tutorial: windows7 system, javascript version 1.8.5, Dell G3 computer.

javascript string replacement characters

To replace all strings in js, you can use the following methods:

Two differences ：Regular&General

str.replace("需要替换的字符串"，"新字符串")　 str.replace(/需要替换的字符串/g，"新字符串")

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Example 1:

"yyyy-MM-dd-hh-mm-ss".replace("-","/")

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The result is as follows:

"yyyy/MM-dd-hh-mm-ss"

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Example 2:

"yyyy-MM-dd-hh-mm-ss".replace(/-/g,"/")

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The result is as follows:

"yyyy/MM/dd/hh/mm/ss"

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In summary:

Regular replacement will only replace the first matching character, regular replacement can replace all

Description: JavaScript replace() method

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

Syntax

stringObject.replace(regexp/substr,replacement)

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Parameters	Description
regexp/substr	Required. A RegExp object that specifies the substring or pattern to be replaced. Note that if the value is a string, it is retrieved as a literal text pattern, rather than first being converted to a RegExp object.
replacement	Required. A string value. Specifies functions for replacing text or generating replacement text.

Parameters

Description

regexp/substr

Required. A RegExp object that specifies the substring or pattern to be replaced.

Note that if the value is a string, it is retrieved as a literal text pattern, rather than first being converted to a RegExp object.

replacement

Required. A string value. Specifies functions for replacing text or generating replacement text.

Return value

A new string obtained by replacing the first match or all matches of regexp with replacement.

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