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js实现footer在底部
晓贰丑的博客
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<html>
  <head>
    <style type="text/css">
      html,body{margin:0;padding: 0;}
      .header{background-color: #ffe4c4;}
      .main{background-color: #bdb76b;}
      .footer{background-color: #ffc0cb;}

      /* 动态为footer添加类fixed-bottom */
      .fixed-bottom {position: fixed;bottom: 0;width:100%;}
    </style>

    <script src="https://libs.baidu.com/jquery/1.7.2/jquery.min.js"></script>
    <script type="text/javascript">
      $(function(){
          function footerPosition(){
              $("footer").removeClass("fixed-bottom");
              var contentHeight = document.body.scrollHeight,//网页正文全文高度
                  winHeight = window.innerHeight;//可视窗口高度,不包括浏览器顶部工具栏
              if(!(contentHeight > winHeight)){
                  //当网页正文高度小于可视窗口高度时,为footer添加类fixed-bottom
                  $(".footer").addClass("fixed-bottom");
              } else {
                  $(".footer").removeClass("fixed-bottom");
              }
          }
          footerPosition();
          $(window).resize(footerPosition);
      });
    </script>
  </head>

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