How to convert uppercase letters to lowercase in javascript

Javascript method to convert uppercase letters to lowercase: 1. Use toLowerCase(), syntax "string.toLowerCase()"; 2. Use toLocaleLowerCase(), syntax "string.toLocaleLowerCase()".

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

Javascript method to convert uppercase letters to lowercase:

Method 1: Use toLowerCase()

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

Syntax:

string.toLowerCase()

Return value:

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

var str="HELLO WORLD!"
document.write(str.toLowerCase())

Method 2: Use toLocaleLowerCase()

toLocaleLowerCase() method according to the language of the local host The environment converts the string to lowercase. Local is determined based on the browser's language settings.

Syntax:

string.toLocaleLowerCase()

Return value:

• A new string in which all uppercase characters of string are converted to Lowercase characters.

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

Note:

Different from toLowerCase(), the toLocaleLowerCase() method converts the string to lower case. Only a few languages ​​(such as Turkish) have local case mapping, so the return value of this method is usually the same as toLowerCase().

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