How to convert lowercase letters to uppercase in javascript

JS method to convert lowercase letters to uppercase: 1. Use toUpperCase() function, syntax "string.toUpperCase()"; 2. Use toLocaleUpperCase() function, syntax "string.toLocaleUpperCase()".

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

javascript method to convert lowercase letters to uppercase

Method 1: Use toUpperCase()

toUpperCase() method is used to convert strings to uppercase.

Syntax:

string.toUpperCase()

Return value: a new string in which all lowercase characters of string are converted to uppercase characters.

var str="Hello World!"
document.write(str.toUpperCase())

Method 2: Use toLocaleUpperCase()

toLocaleUpperCase() method is used to convert strings to uppercase.

Syntax:

string.toLocaleUpperCase()

Return value: a new string in which all lowercase characters of string are converted to uppercase characters.

Note: The toLocaleUpperCase() method converts the string to uppercase according to the local method. Only a few languages ​​(such as Turkish) have local case mapping, so the return value of this method is usually the same as toUpperCase().

var str="Hello World!"
console.log(str.toLocaleUpperCase());

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