jquery结合css实现返回顶部功能 jquery结合css实现返回顶部功能

css操作

CSS$("").css(name|pro|[,val|fn])位置$("").offset([coordinates])$("").position()$("").scrollTop([val])$("").scrollLeft([val])尺寸$("").height([val|fn])$("").width([val|fn])$("").innerHeight()$("").innerWidth()$("").outerHeight([soptions])$("").outerWidth([options])

实例返回顶部

Titlebody{margin: 0px; }.returnTop{height: 60px; width: 100px; background-color: darkgray; position: fixed; right: 0; bottom: 0; color: greenyellow; line-height: 60px; text-align: center; }.div1{background-color: orchid; font-size: 5px; overflow: auto; width: 500px; }.div2{background-color: darkcyan; }.div3{background-color: aqua; }.div{height: 300px; }.hide{display: none; }hello
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返回顶部

Title*{margin: 0; padding: 0; }.div1{height: 100px; width: 100px; background-color: red; }.div3{height: 120px; width: 120px; background-color: seagreen; }.div2{position: relative; }.div4{background-color: aquamarine; width: 150px; height: 150px; padding: 5px; margin: 6px; border: 4px solid green; }.div5{width: 50%; height: 200px; overflow: auto; }.div6{width: 100%; height: 1000px; }.div5{background-color: aquamarine; }.div6{background-color: chocolate; }.div7{width: 90px; height: 60px; position: fixed; right: 20px; bottom: 20px; background-color: yellow; text-align: center; /*文本横向居中*/line-height: 60px; /*文本行高*/}.hide{display: none; }hellohellohellohellohellohellohellohellohellohello返回顶部

实例扩展：
CSS：

.backToTop {display: none; width: 18px; line-height: 1.2; padding: 5px 0; background-color: #000; color: #fff; font-size: 12px; text-align: center; position: fixed; _position: absolute; right: 10px; bottom: 100px; _bottom: "auto"; cursor: pointer; opacity: .6; filter: Alpha(opacity=60); }

jQuery代码

(function() { var $backToTopTxt = "返回顶部", $backToTopEle = $('').appendTo($("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(); }); })(); ：

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