How javascript converts uppercase letters to lowercase

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Javascript converts uppercase letters to lowercase: 1, use toLowerCase (), syntax "string.toLowerCase ()"; 2, use toLocaleLowerCase (), syntax "string.toLocaleLowerCase ()".

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

How javascript converts uppercase letters to lowercase:

Method 1: using toLowerCase ()

The toLowerCase () method is used to convert strings to lowercase.

Syntax:

String.toLowerCase ()

Return value:

A new string in which all uppercase characters of the string are converted to lowercase characters.

Var str= "HELLO WORLD!" [xss_clean] (str.toLowerCase ())

Method 2: using toLocaleLowerCase ()

The toLocaleLowerCase () method converts the string to lowercase based on the locale of the host. The local is judged by the language setting of the browser.

Syntax:

String.toLocaleLowerCase ()

Return value:

A new string in which all uppercase characters of the string are converted to lowercase characters.

Var str= "HELLO WORLD!" console.log (str.toLocaleLowerCase ())

Description:

Unlike toLowerCase (), the toLocaleLowerCase () method converts strings to lowercase locally. Only a few languages, such as Turkish, have local case mappings, and the return value of all this method is usually the same as toLowerCase ().

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