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oofw5751
9年前发布

判断滚动条到底部的JS代码

lazyload.js          

  //滚动条在Y轴上的滚动距离     function getScrollTop(){    var scrollTop = 0, bodyScrollTop = 0, documentScrollTop = 0;    if(document.body){      bodyScrollTop = document.body.scrollTop;    }    if(document.documentElement){      documentScrollTop = document.documentElement.scrollTop;    }    scrollTop = (bodyScrollTop - documentScrollTop > 0) ? bodyScrollTop : documentScrollTop;    return scrollTop;  }    //文档的总高度    function getScrollHeight(){    var scrollHeight = 0, bodyScrollHeight = 0, documentScrollHeight = 0;    if(document.body){      bodyScrollHeight = document.body.scrollHeight;    }    if(document.documentElement){      documentScrollHeight = document.documentElement.scrollHeight;    }    scrollHeight = (bodyScrollHeight - documentScrollHeight > 0) ? bodyScrollHeight : documentScrollHeight;    return scrollHeight;  }    //浏览器视口的高度    function getWindowHeight(){    var windowHeight = 0;    if(document.compatMode == "CSS1Compat"){      windowHeight = document.documentElement.clientHeight;    }else{      windowHeight = document.body.clientHeight;    }    return windowHeight;  }    window.onscroll = function(){    if(getScrollTop() + getWindowHeight() == getScrollHeight()){      alert("you are in the bottom!");    }  };   

lazyload-jQuery.js  

$(window).scroll(function(){    var scrollTop = $(this).scrollTop();    var scrollHeight = $(document).height();    var windowHeight = $(this).height();    if(scrollTop + windowHeight == scrollHeight){      alert("you are in the bottom");    }  });  

[文件] lazyLoad.html     

<!doctype html>  <html lang="en" style="height:900px;">   <head>    <meta charset="UTF-8">    <meta name="Author" content="forever">    <link rel="stylesheet" href="css/lazyload.css" />    <script type="text/javascript" src="js/jquery-1.7.2.min.js"></script>    <title>lazyLoad</title>    <script type="text/javascript">      $(function(){    var $ul=$("#lazyLoadWrap").find("ul");    $(window).scroll(function(){       var scrollTop = $(this).scrollTop();       var scrollHeight = $(document).height();       var windowHeight = $(this).height();       if(scrollTop + windowHeight == scrollHeight){       for(var i=0;i<6;i++){        $ul.append("<li>Hello</li>");       }       }    });   });    </script>   </head>   <body>   <div id="lazyLoadWrap">    <ul>     <li></li>     <li></li>     <li></li>     <li></li>     <li></li>     <li></li>     <li></li>     <li></li>     <li></li>     <li></li>     <li></li>     <li>12</li>    </ul>   </div>   </body>  </html>