一、背景
设计狮童鞋总是会设计各种高大上的效果图，比如下面这个土豪金的效果。
该图中“已阅读并同意相关服务条款”前面的复选框有一个金色的边框，打钩时是一个金色的对勾。接下来说说怎样实现该效果。
二、解决方法1、纯css解决方法
在css3 选择器（三）一文中介绍过一个选择器【:checked】选择器。
单选按钮和复选按钮都有选中和未选中状态。要设置这两个按钮默认样式稍微复杂点。该文通过:checked选择器配合其他表情实现自定义样式。
举例：使用:checked选择器模拟实现复选框样式。
<meta charset="utf-8"><style type="text/css">form { border: 1px solid #ccc; padding: 20px; width: 300px; margin: 30px auto;}.wrapper { margin-bottom: 10px;}.box { display: inline-block; width: 20px; height: 20px; margin-right: 10px; position: relative; border: 2px solid orange; vertical-align: middle;}.box input { opacity: 0;}.box span { position: absolute; top: -10px; right: 3px; font-size: 30px; font-weight: bold; font-family: Arial; -webkit-transform: rotate(30deg); transform: rotate(30deg); color: orange;}input[type="checkbox"] + span { opacity: 0;}input[type="checkbox"]:checked + span { opacity: 1;}</style><form action="#"> <div class="wrapper"> <div class="box"> <input type="checkbox" checked="checked" id="username" /><span>√</span> </div> <label for="username">我是选中状态</label> </div> <div class="wrapper"> <div class="box"> <input type="checkbox" id="userpwd" /><span>√</span> </div> <label for="userpwd">我是未选中状态</label> </div></form> 模拟实现一个选中和未选中的样式。
没有样式时的效果图如下，
最终添加样式后效果如下。
实际开发中，我尝试使用这种方法。
这种方法有个问题：点选框时无法选中，必须点文字才能选中 。
这在实际应用中肯定是无法忍受的,实际应用中推荐第二种方法。
2、配合js解决方法
用到图片：
原理：label和input外面套一层.custom-checkbox作为父元素相对定位。
input绝对定位于左上角，label也绝对定位于左上角，覆盖input的方块。通过给label设置padding-left和背景图来模拟未选中状态。选中时加一个.right类更改背景图片为选中状态的背景图。
通过js点击事件，label被点击时在选中与未选中状态切换。
<meta charset="utf-8"/><style type="text/css">.custom-checkbox{border:1px solid red;position:relative;height:30px;}.custom-checkbox input{position:absolute;}.custom-checkbox label{padding-left:20px;position:absolute;top:-1px;left:0;background:url(images/bg-unchecked.png) no-repeat top 4px left 3px;}.custom-checkbox label.right{background:url(images/bg-checked.png) no-repeat top 2px left 3px;}</style><body><div class="custom-checkbox"><input type="checkbox" id="test"/><label for="test">已阅读并同意相关服务条款</label></div><script src="http://code.jquery.com/jquery-latest.js"></script><script type="text/javascript"> $('.custom-checkbox label').click(function(){ if($(this).hasClass('right')){ $('.custom-checkbox label').removeClass("right"); }else{ $('.custom-checkbox label').addClass("right"); } });</script></body> 问题：点击频率过快，会双击选中文字，影响用户体验。
解决办法：
<label for="test" onselectstart="return false;" style="-moz-user-select:none;">已阅读并同意相关服务条款</label>
效果：
三、总结单选框样式和复选框原理是类似的。上面办法都是一种模拟实现。
正如我在::before和::after伪元素的用法 一文中说过，早在10年我们会使用::before和::after来实现多背景图片，现在css3多背景已成为标准；我们对复选框样式的模拟实现也许会推动它成为标准，这也就是我们为后人做的贡献了，让他们工作更轻松。
还有一点我想说的是推动前端技术发展的，不仅有前端同行们，还有我们可爱的设计师们。如果只有前端，我们会停留在已有技术的可行性上做一些保守的效果，但是有了设计师的“完美主义”，让我们脑洞大开，挑战自我，促进技术更上一层楼。
本文作者starof,因知识本身在变化，作者也在不断学习成长，文章内容也不定时更新，为避免误导读者，方便追根溯源，请诸位转载注明出处：有问题欢迎与我讨论，共同进步。
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