How to convert string case in javascript

Javascript string case conversion method: 1. Use toLocaleLowerCase() or toLowerCase() to convert the string to lowercase; 2. Use toLocaleUpperCase() or toUpperCase() method to convert the string to uppercase.

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

String defines 4 prototype methods to implement string case conversion operations. The description is shown in the table.

The following code converts all strings to uppercase. toLocaleLowerCase() and toLocaleUpperCase() are two localized prototype methods. They convert uppercase and lowercase letters natively, and since only a few languages ​​(such as Turkish) have local-specific case mapping, they are usually the same as the return values ​​of the toLowerCase() and toUpperCase() methods. [Recommended learning:

String String case conversion method

String method	Description
toLocaleLowerCase()	Convert the string to lowercase according to the local host’s locale Convert the string to uppercase
toLowerCase()	Convert the string to lowercase
toUpperCase()	Convert the string to uppercase
	var s = "JavaScript"; console.log(s.toUpperCase()); //返回字符串“JAVASCRIPT”

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