PROSAGA码农传奇-jQuery-点击外面时避免下拉关闭

<div class =“post-text”itemprop =“text”>
  <P>
    我认为你只需要制作自己的菜单切换点击事件，而不是使用一个bootstrap提供然后尝试覆盖的东西
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  <H2>
    Bootstrap 3
  </H2>
  <P>
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  <div class =“snippet”data-lang =“js”data-hide =“false”data-console =“true”data-babel =“false”>
    <div class =“snippet-code”>
       <pre class="snippet-code-js lang-js prettyprint-override">
        <code>
          var $ddlBtn = $("#my-custom-ddl");
$ddlBtn.on("click", function(){
  var expanded = /true/i.test($ddlBtn.attr("aria-expanded"));
  $ddlBtn
    .attr("aria-expanded", !expanded)
    .parent().toggleClass("open");
});
        </code>
      </pre>
       <pre class="snippet-code-html lang-html prettyprint-override">
        <code>
          <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<link rel="stylesheet" type="text/css" href="https://netdna.bootstrapcdn.com/bootstrap/3.0.0/css/bootstrap.min.css" />

<div class="dropdown">
  <button class="btn btn-primary dropdown-toggle" type="button" id="my-custom-ddl" aria-haspopup="true" aria-expanded="false">
    Dropdown Example
    <span class="caret"></span>
  </button>
  <ul class="dropdown-menu">
    <li><a href="#">HTML</a></li>
    <li><a href="#">CSS</a></li>
    <li><a href="#">JavaScript</a></li>
  </ul>
</div>
        </code>
      </pre>
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  <P>
  </p>
  <H2>
    Bootstrap 4
  </H2>
  <P>
  </p>
  <div class =“snippet”data-lang =“js”data-hide =“false”data-console =“true”data-babel =“false”>
    <div class =“snippet-code”>
       <pre class="snippet-code-js lang-js prettyprint-override">
        <code>
          var $ddlBtn = $("#my-custom-ddl");
$ddlBtn.on("click", function(){
  var expanded = /true/i.test($ddlBtn.attr("aria-expanded"));
  $ddlBtn
    .attr("aria-expanded", !expanded)
    .siblings(".dropdown-menu").toggleClass("show")
    .parent().toggleClass("show");
});
        </code>
      </pre>
       <pre class="snippet-code-html lang-html prettyprint-override">
        <code>
          <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<link rel="stylesheet" type="text/css" href="https://netdna.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css" />

<div class="dropdown">
  <button class="btn btn-primary dropdown-toggle" type="button" id="my-custom-ddl" aria-haspopup="true" aria-expanded="false">
    Dropdown Example
    <span class="caret"></span>
  </button>
  <div class="dropdown-menu" aria-labelledby="my-custom-ddl">
    <a class="dropdown-item" href="#">HTML</a>
    <a class="dropdown-item" href="#">CSS</a>
    <a class="dropdown-item" href="#">Javascript</a>
  </div>
</div>
        </code>
      </pre>
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  <P>
  </p>
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