网站设计中返回顶部学习记录

html:

<!DOCTYPE html>
<html lang="zh-cn">
 <head> 
  <meta charset="UTF-8" /> 
  <title>网络科技</title>
        <meta name="keywords" content="网络科技企业公司" /> 
        <meta name="description" content="网络科技企业公司" /> 
        <meta name="viewport" content="width=device-width,initial-scale=1.0,maximum-scale=1.0,minimum-scale=1.0,user-scalable=no" />  
  <link rel="stylesheet" href="css/bootstrap.min.css">
  <link rel="stylesheet" href="css/style.css"> <!--控制返回顶部css效果-->
  <script type="text/javascript" src="js/jquery-2.2.4.min.js"></script> <!--必须引入-->
  <script src="js/bootstrap.min.js"></script> <!--必须引入-->
 </head> 
 <body> 
  <script>
  //返回顶部js
  (function() {
      var $backToTopTxt = "返回顶部", $backToTopEle = $('<div class="backToTop"></div>').appendTo($("body"))
          .text($backToTopTxt).attr("title", $backToTopTxt).click(function() {
              $("html, body").animate({ scrollTop: 0 }, 120);
      }), $backToTopFun = function() {
          var st = $(document).scrollTop(), winh = $(window).height();
          (st > 0)? $backToTopEle.show(): $backToTopEle.hide();
          //IE6下的定位
          if (!window.XMLHttpRequest) {
              $backToTopEle.css("top", st + winh - 166);
          }
      };
      $(window).bind("scroll", $backToTopFun);
      $(function() { $backToTopFun(); });
  })();
  </script>
 </body>
</html>

style.css:

/*返回顶部*/
.backToTop {
 display: none;
 width: 30px;
 line-height: 1.2;
 padding: 5px 0;
 background-color: #000;
 color: #00dfb1;
 font-size: 16px;
 text-align: center;
 position: fixed;
 _position: absolute;
 right: 10px;
 bottom: 100px;
 _bottom: "auto";
 cursor: pointer;
 opacity: 0.6;
 filter: Alpha(opacity=60);
}

网站设计中返回顶部学习记录

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