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This article mainly explains "javascript how to replace all the specified strings". The content in the article is simple and clear, and it is easy to learn and understand. Please follow the editor's train of thought to study and learn "how javascript replaces all specified strings".

The operating environment of this tutorial: windows7 system, javascript1.8.5 version, Dell G3 computer.

Javascript replace () method

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.

Syntax format:

String.replace (searchvalue,newvalue)

Searchvalue: yes. A RegExp object that specifies the substring or the schema to replace.

Note that if the value is a string, it is treated as an immediate amount of text pattern to retrieve, rather than being first converted to a RegExp object.

Newvalue: required. A string value. Specifies the function that replaces the text or generates the alternate text.

The second parameter of the replace () method can use the function, which is called when the match occurs, the return value of the function is used as the replacement text, and the function can receive special characters prefixed with $to reference information about the matching text.

The special character convention string in the second parameter of the replace () method describes $1, $2,..., $99 text matching the 1st through 99th subexpression in the regular expression $& (dollar sign + hyphen) substring $'(dollar sign + switch skill key) matching regular expression $'(dollar sign + single quotation mark) text $'(dollar sign + single quotation mark) to the left of the matching substring $$represents the $string to the right of the matching string

Return value: a new string, obtained after replacing the first match or all matches of regexp with replacement.

Example: the replace () method replaces all strings

Var str= "hello"; var a=str.replace ("hello", "HI"); console.log (a)

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