How to convert letters to uppercase and lowercase in jquery?

Letter case conversion method: 1. Use toLowerCase() method to convert uppercase letters to lowercase, the syntax is ""uppercase letters".toLowerCase()"; 2. Use toUpperCase() method to convert lowercase letters to Uppercase, syntax ""lowercase letters".toUpperCase()".

The operating environment of this article: windows10 system, jquery2.2.4, this article is applicable to all brands of computers.

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jquery letter case conversion

1. Convert uppercase to lowercase

"ABC".toLowerCase()//转小写

toLowerCase() method is used to convert a string to lowercase.

2. Convert lowercase to uppercase

"abc".toUpperCase()//转大写

toUpperCase() method is used to convert a string to uppercase.

Use case:

When the input box loses focus, convert the content to uppercase

<div id="app" >  
    <input type="text" id="in">
</div>
<script>
$(&#39;#in&#39;).blur(function() {
    $(this).val($(this).val().toUpperCase());
});
</script>

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