bootstrap响应式导航栏点击collapse的按钮没有反应,不会向下展开

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想报就报 </strong></div>
<div style="padding-top:0px;color:#3D4D58;font-family:宋体;font-size:20px;">
Want to reimburse for reimbursement
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<div style="color:#00A1D5;padding-top:0px; margin-top:0px; line-height:5px;">
___________________________
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<p><img src="Public/ybx/assets/img/qiye.png"></p>
<h4 style=" font-family:微软雅黑; font-size:20px;"><strong>替企业省钱</strong></h4>
<p style="font-size:18px; font-family:微软雅黑; color:#545454">解决费用报销困扰</p>
<p style="font-size:18px; font-family:微软雅黑; color:#545454">帮助企业降本成效 </p>
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<p><img src="Public/ybx/assets/img/caiwu.png"></p>
<h4 style=" font-family:微软雅黑; font-size:20px;"><strong>让财务省心</strong></h4>
<p style="font-size:18px; font-family:微软雅黑; color:#545454">提高审核效率</p>
<p style="font-size:18px; font-family:微软雅黑; color:#545454">方便会计记账 </p>
</div>
<div class="col-md-4" style="padding-top:43px; padding-bottom:44px; ">
<p><img src="Public/ybx/assets/img/yuangong.png"></p>
<h4 style=" font-family:微软雅黑; font-size:20px;"><strong>帮员工省力</strong></h4>
<p style="font-size:18px; font-family:微软雅黑; color:#545454">随手记录因公消费</p>
<p style="font-size:18px; font-family:微软雅黑; color:#545454">省去报销填报烦恼 </p>
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funtion
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<div class="" style="width:448px; height:200px; background-color:#FFFFFF;">
<div style=" float:left;padding-left:67px; padding-top:50px;"><img src="Public/ybx/assets/img/feiyong.png" height="96" width="96"></div>
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<div style="text-align:center; font-size:18px; font-family:微软雅黑; color:#545454;padding-top:20px;">随时随地查费用<br>
多维度统计分析<br>
现金流了然于心<br></div>
</div>
</div>
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<div class="" style="width:448px; height:200px; background-color:#FFFFFF;">
<div style=" float:left;padding-left:67px; padding-top:50px;"><img src="Public/ybx/assets/img/shenpi.png" height="96" width="96"></div>
<div style="text-align:left;">
<div style="text-align:center;font-size:28px;height:55px;line-height:40px;font-weight:bold;padding-top:25px; font-size:20px; color:#00A1D5; font-family:微软雅黑;">审批简单柔性</div>
<div style="text-align:center; font-size:18px; font-family:微软雅黑; color:#545454;padding-top:20px;">无须预先配置<br>
审批就是@<a>&nbsp;&nbsp;&nbsp;</a><br>支持多级流程<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;机器自动学习</div>
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</div>
</div>
<div class="col-md-6" style="text-align: center; padding-left:64px;padding-top:20px;">
<div class="" style="width:448px; height:200px; background-color:#FFFFFF;">
<div style=" float:left;padding-left:67px; padding-top:50px;"><img src="Public/ybx/assets/img/suishouji.png" height="96" width="96"></div>
<div style="text-align:left;">
<div style="text-align:center;font-size:28px;height:40px;line-height:40px;font-weight:bold;padding-top:30px; font-size:20px; color:#00A1D5; font-family:微软雅黑;">随手记录消费</div>
<div style="text-align:center; font-size:18px; font-family:微软雅黑; color:#545454;padding-top:30px;">消费随手记录<br>
每笔清清爽爽<br>
报销自动生成<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;告别手工填报<br>
</div>
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<div class="" style="width:448px; height:200px; background-color:#FFFFFF;">
<div style=" float:left;padding-left:67px; padding-top:50px;"><img src="Public/ybx/assets/img/xiangmu.png" height="96" width="96"></div>
<div style="text-align:left;">
<div style="text-align:center;font-size:28px;height:40px;line-height:40px;font-weight:bold;padding-top:30px; font-size:20px; color:#00A1D5; font-family:微软雅黑;">项目费用管理</div>
<div style="text-align:center; font-size:18px; font-family:微软雅黑; color:#545454;padding-top:30px;">支持以项目形式组<br>织报销流程和业务<br>实现项目层级的精<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;细管理和精准核算</div>
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已邀请:
<div class="navbar-collapse collapse navbar-right">
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改成
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