HTML
CSS
JavaScript
HTML
<!DOCTYPE html>
<html lang="zh">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1, user-scalable=no" />
<title>模态框的最大化 - 光年(Light Year Admin)后台管理系统模板</title>
<link rel="icon" href="favicon.ico" type="image/ico">
<meta name="keywords" content="LightYear,光年,后台模板,后台管理系统,光年HTML模板">
<meta name="description" content="LightYear是一个基于Bootstrap v3.3.7的后台管理系统的HTML模板。">
<meta name="author" content="yinqi">
<link href="http://lyear.itshubao.com/iframe/css/bootstrap.min.css" rel="stylesheet">
<link href="http://example.itshubao.com/demo/css/materialdesignicons.min.css" rel="stylesheet">
<link href="http://lyear.itshubao.com/iframe/css/style.min.css" rel="stylesheet">
</head>
  
<body>
<div class="container-fluid p-t-15">
  
  <div class="row">
    <div class="col-md-12">
      <div class="card">
        <div class="card-header"><h4>模态框的最大化</h4></div>
        <div class="card-body">
          
          <p>这里旨在对模态框增加最大化的功能(因为是模态框的原因，在保留模态框的一些样式基础上最最大化处理)。css和绑定事件的js可以放到通用的文件当中，模态框新增最大化按钮即可。</p>
          <button type="button" class="btn btn-primary" data-toggle="modal" data-target="#myModal">
            打开模态框
          </button>
          <div class="modal fade" id="myModal" tabindex="-1" role="dialog" aria-labelledby="myModalLabel">
            <div class="modal-dialog" role="document">
              <div class="modal-content">
                <div class="modal-header">
                  <button type="button" class="close" data-dismiss="modal" aria-label="Close"><span aria-hidden="true">&times;</span></button>
                  <button type="button" class="modal-fullscreen-btn pull-right m-r-5"><i class="mdi"></i></button>
                  <h4 class="modal-title" id="myModalLabel">标题</h4>
                </div>
                <div class="modal-body">
                内容
                </div>
                <div class="modal-footer">
                  <button type="button" class="btn btn-default" data-dismiss="modal">Close</button>
                  <button type="button" class="btn btn-primary">Save changes</button>
                </div>
              </div>
            </div>
          </div>
          
        </div>
      </div>
    </div>
    
  </div>
  
</div>

<script type="text/javascript" src="http://lyear.itshubao.com/iframe/js/jquery.min.js"></script>
<script type="text/javascript" src="http://lyear.itshubao.com/iframe/js/bootstrap.min.js"></script>
</body>
</html>
CSS
.modal-fullscreen-btn {
    border: none;
    background-color: transparent;
    text-shadow: 0 1px 0 #fff;
    color: #000;
    opacity: 0.2;
    font-size: 16px;
    line-height: 1.3;
    font-weight: 700;
}
.modal-fullscreen-btn .mdi:before {
    content: "\f293";
}
.modal-fullscreen-btn:hover {
    opacity: .5;
}
.modal-fullscreen {
    padding-left: 0px!important;
}
.modal-fullscreen .modal-fullscreen-btn {
    opacity: .8;
}
.modal-fullscreen .modal-fullscreen-btn .mdi:before {
    content: "\f294";
}
.modal-fullscreen .modal-dialog {
    width: -webkit-calc(100% - 20px);
	width: calc(100% - 20px);
    max-width: calc(100% - 20px);
    margin: 8px auto;
}
.modal-fullscreen .modal-dialog .modal-body {
    height: -webkit-calc(100vh - 56px - 69px - 20px);
    height: calc(100vh - 56px - 69px - 20px);
    overflow-y: auto;
}
JavaScript
$(document).ready(function() {
    $(document).on('click', '.modal-fullscreen-btn', function(){
        $(this).closest('.modal').toggleClass('modal-fullscreen');
    });
});