首先是页面上：

 <p class="row cl">
 <label class="form-label col-xs-4 col-sm-3" style="width: 20%"><span class="c-red">*</span>是否存在促销活动：</label>
<p class="formControls col-xs-8 col-sm-9 skin-minimal">
<p class="check-box">
<input type="checkbox" value="1" id="isHaveActive" >
<label for="isHaveActive"> </label>
</p>
</p>
</p>
 
 <p id="active" name="active" style="display:none;">
 <p class="row cl" >
<label class="form-label col-xs-4 col-sm-3" style="width: 20%"><span class="c-red">*</span>现价：</label>
<p class="formControls col-xs-8 col-sm-9">
<input type="number" step="0.01" class="input-text" value="${priceChange.price}" placeholder="" id="price" name="price" >
元/L
</p>
</p> 
 
 <p class="row cl" >
<label class="form-label col-xs-4 col-sm-3" style="width: 20%"><span class="c-red">*</span>活动名：</label>
<p class="formControls col-xs-8 col-sm-9">
<input type="text" class="input-text" value="${priceChange.active_name}" placeholder="" id="active_name" name="active_name" >
</p>
</p> 
 <p class="row cl" >
<label class="form-label col-xs-4 col-sm-3" style="width: 20%"><span class="c-red">*</span>距挂牌价：</label>
<p class="formControls col-xs-8 col-sm-9">
<input type="number" step="0.01" class="input-text" value="${priceChange.gap_guapai}" placeholder="" id="gap_guapai" name="gap_guapai" >
元/L
</p>
</p> 
 
 <p class="row cl" >
<label class="form-label col-xs-4 col-sm-3" style="width: 20%"><span class="c-red">*</span>促销活动形式：</label>
<p class="formControls col-xs-8 col-sm-9">
<input type="text" class="input-text" value="${priceChange.activity_form}" placeholder="" id="activity_form" name="activity_form" >
</p>
</p> 
 <p class="row cl" >
<label class="form-label col-xs-4 col-sm-3" style="width: 20%"><span class="c-red">*</span>促销活动优惠幅度：</label>
<p class="formControls col-xs-8 col-sm-9">
<input type="number" step="0.01" class="input-text" value="${priceChange.activity_gap}" placeholder="" id="activity_gap" name="activity_gap" >
元/L
</p>
</p> 
</p>

然后是jquery中的实现

jQuery(document).ready(function($) { 
 
//是否添加活动内容 
 
$("#isHaveActive").change(function(){ 
 
 var p = $("#active"); 
 p.css("display") === "none" && p.show() || p.hide(); 
 
 });