How to convert string to uppercase in javascript

Javascript method to convert string to uppercase: 1. Convert the string to uppercase through the "str.toUpperCase" method and return it; 2. Convert the string to uppercase according to the localization through the "str.toLocaleUpperCase" method A new string converted to uppercase by the mapping rule.

The operating environment of this article: Windows 7 system, JavaScript version 1.8.5, DELL G3 computer.

JavaScript-Method to convert string to uppercase

str.toUpperCase()

str.toUpperCase() The method converts the string to uppercase and returns

var str = "Hello World Hello World";
var str2 = str.toUpperCase();
console.log(str2);//HELLO WORLD HELLO WORLD

str.toLocaleUpperCase()

str.toLocaleUpperCase() The method returns the string according to the localized case A new string converted to uppercase by the mapping rule.

toLocaleUpperCase() will not affect the value of the input string itself; in most cases, this method will produce the same value as toUpperCase(), but for some languages ​​(locale), such as Turkish, because Their case mapping rules are different from Unicode's default mapping rules, so calling these two methods will produce different results

var str = "Hello World Hello World";
var str2 = str.toLocaleUpperCase();
console.log(str2);//HELLO WORLD HELLO WORLD

[Recommended learning: js basic tutorial]

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