change(fn)
Bind a handler function to the change event of each matching element. The
change event is triggered when an element loses focus, and also when its value changes after gaining focus.
If you need to introduce external Js, you need to refresh to execute ] <script>
$(function(){
$('#fontsize').change(function(){
var size = $('#fontsize').val();
$('p').css('font-size', size);
});
$('#backgoundcolor').change(function(){
var bgc = $('#backgoundcolor').val();
$('p').css('background', bgc);
});
$('#fontcolor').change(function(){
var fontcolor = $('#fontcolor').val();
$('p').css('color', fontcolor);
});
});
</script>
![[Web front-end] Node.js quick start](https://img.php.cn/upload/course/000/000/067/662b5d34ba7c0227.png)
