JavaScript implements click-button font enlargement and reduction_javascript skills

This article will share with you the js example code for enlarging and reducing the font size of click buttons. The code is simple and easy to understand. Friends who need it can refer to it

The specific code is as follows:

<style>
.bb{color:red;}
.cc{color:green;}
.chapter {font-size: 1.5em;}
.normal{font-size:12px;}
.hidden{display:none;}
</style>
<script>
$(document).ready(function() {
$('div.aa').addClass('bb');
$('a[href^="http:"]').addClass('cc');
//$('#switcher-large').on('click',function(){
// $('div.large').addClass('chapter'); 
//});
$('#switcher-large').click(function(){ 
$('div.large').toggleClass('chapter');
$(this).toggleClass('bb'); 
});
//$('#switcher').click(function(){//点击按钮增加（移除）样式（toggleClass方法）
//$('#switcher button').toggleClass('hidden');
//})
//字体的放大缩小
var $biger = $('div.large');
var num = parseFloat($biger.css('fontSize')); 
$('#switcher-bigger').click(function(){ 
num=num*1.4;
$biger.css('fontSize',num+'px');
});
$('#switcher-small').click(function(){
num=num/1.4;
$biger.css('fontSize',num+'px');
});
});
</script>
<div id="switcher" class="switcher">
<h3 id="Style-Switcher">Style Switcher</h3>
<button id="switcher-default"> Default </button>
<button id="switcher-hidden">Narrow hidden</button>
<button id="switcher-large">Large Print</button>
<button id="switcher-bigger">switcher-bigger</button>
<button id="switcher-small">switcher-small</button>
</div>
<div class="large">
<p>脚本之家</p>
<p>脚本之家</p>
<p>脚本之家</p>
<p>脚本之家</p>
</div>

That’s all the relevant knowledge about how to use JavaScript to enlarge and reduce the font size of click buttons. I hope it will be helpful to you!