自定义表单样式之checkbox和radio1，起因
最近在工作中要实现自定义式的radio样式，而我们通常使用的时默认的样式，因为自己实在想不到解决的方法，于是开始搜索，最终看到了不错的解决办法，可以完美解决我们遇到的问题。
2，原理
大家都知道在写结构的时候，radio或checkbox都会跟随label一起使用，label的for属性值和input的id值相同的情况下，点击label就可以选中input，这里正是利用label来覆盖我们的input默认样式，通过给label添加背景图片（美化的checkbox或radio），也就是在点击的过程中，我们是看不到默认的input的（给input设置z-index:-1），而点击的是label，通过不同的事件，加载不同的背景图片（这里是改变背景图片的位置）
3，设置美化checkbox或radio的默认样式
（1）页面结构
<form class="form" method="post"><fieldset><legend>Which genres do you like?</legend><input type="checkbox" value="action" id="check-1" name="genre"><label for="check-1" class="">Action / Adventure</label><input type="checkbox" value="comedy" id="check-2" name="genre"><label for="check-2" class="">Comedy</label><input type="checkbox" value="epic" id="check-3" name="genre"><label for="check-3" class="">Epic / Historical</label><input type="checkbox" value="science" id="check-4" name="genre"><label for="check-4" class="">Science Fiction</label><input type="checkbox" value="romance" id="check-5" name="genre"><label for="check-5" class="">Romance</label><input type="checkbox" value="western" id="check-6" name="genre"><label for="check-6" class="">Western</label></fieldset><fieldset><legend>Caddyshack is the greatest movie of all time, right?</legend><input type="radio" value="1" id="radio-1" name="opinions"><label for="radio-1" class="">Totally</label><input type="radio" value="1" id="radio-2" name="opinions"><label for="radio-2" class="">You must be kidding</label><input type="radio" value="1" id="radio-3" name="opinions"><label for="radio-3" class="">What's Caddyshack?</label></fieldset></form>
（2）jquerycode（前提必须引入jquery库）
jQuery.fn.customInput = function(){$(this).each(function(i){if($(this).is('[type=checkbox],[type=radio]')){var input = $(this);//get the associated label using the input's idvar label = $('label[for='+input.attr('id')+']');//get type,for classname suffixvar inputType = (input.is('[type=checkbox]')) ? 'checkbox' : 'radio';//wrap the input + label in a div$('<div class="custom-'+ inputType +'"></div>').insertBefore(input).append(input,label);//find all inputs in this set using the shared name attributevar allInputs = $('input[name='+input.attr('name')+']');//necessary for browsers that don't support the :hover pseudo class on labelslabel.hover(function(){$(this).addClass('hover');if(inputType == 'checkbox' && input.is(':checked')) {$(this).addClass('checkedHover');}},function(){$(this).removeClass('hover checkedHover');});//bind custom event, trigger it, bind click,focus,blur eventsinput.bind('updateState',function(){if(input.is(':checked')){if(input.is(':radio')){allInputs.each(function(){$('label[for='+$(this).attr('id')+']').removeClass('checked');});};label.addClass('checked');} else {label.removeClass('checked checkedHover checkedFocus');}}).trigger('updateState').click(function(){$(this).trigger('updateState');}).focus(function(){label.addClass('focus');if(inputType == 'checkbox' && input.is(':checked')) {$(this).addClass('checkedFocus');}}).blur(function(){label.removeClass('focus checkedFocus');});}});}引入jquery库，再引入上面的代码后，就可以执行下面的代码
$('input').customInput();（3）生成的外层div
如果你的代码结构是label和input成对写的话，那么在它们的外层就会生成一个div，如图
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