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\u4e0b\u3078\u30b9\u30af\u30ed\u30fc\u30eb\u3059\u308b\u3068\u73fe\u308c\u308b\u30da\u30fc\u30b8\u30c8\u30c3\u30d7\u3078\u623b\u308b\u30dc\u30bf\u30f3\u3092jQuery\u3067\u4f5c\u3063\u3066\u307f\u307e\u3057\u305f\u3002<\/p>\n
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<script>\r\n\t\t$(function () {\r\n\t\t\t\/\/\u4ee5\u4e0b\u3001\u30da\u30fc\u30b8\u30c8\u30c3\u30d7\u3078\u623b\u308b\u30dc\u30bf\u30f3\u3092\u30b9\u30af\u30ed\u30fc\u30eb\u306b\u5408\u308f\u305b\u3066fadeIn\u3001fadeOut\r\n\t\t\t$(window).on(\"load scroll\", function () {\r\n\t\t\t\tvar $this = $(this);\r\n\r\n\t\t\t\tif ($this.scrollTop() > 50) { \/\/50px\u30b9\u30af\u30ed\u30fc\u30eb\u3057\u305f\u6642\r\n\t\t\t\t\t$(\"#pageTop\").stop();\r\n\t\t\t\t\t$(\"#pageTop\").fadeTo(100, 1);\r\n\t\t\t\t} else {\r\n\t\t\t\t\t$(\"#pageTop\").stop();\r\n\t\t\t\t\t$(\"#pageTop\").fadeTo(100, 0);\r\n\t\t\t\t}\r\n\t\t\t});\r\n\r\n\t\t\t\/\/\u4ee5\u4e0b\u3001\u30b9\u30e0\u30fc\u30ba\u30b9\u30af\u30ed\u30fc\u30eb\r\n\t\t\t$(\"a[href^='#']\").click(function () {\r\n\t\t\t\tvar href = $(this).attr(\"href\"),\r\n\t\t\t\t\ttarget = 0,\r\n\t\t\t\t\ttargetTop = $(\"body\").offset().top;\r\n\r\n\t\t\t\tif (href === \"#\") {\r\n\t\t\t\t\t$(\"body,html\").animate({\r\n\t\t\t\t\t\tscrollTop: targetTop\r\n\t\t\t\t\t}, 700, \"swing\");\r\n\t\t\t\t\treturn false;\r\n\t\t\t\t} else {\r\n\t\t\t\t\ttarget = $(href).offset().top;\r\n\t\t\t\t\t$(\"body,html\").animate({\r\n\t\t\t\t\t\tscrollTop: (target - 25)\r\n\t\t\t\t\t}, 700, \"swing\");\r\n\t\t\t\t\treturn false;\r\n\t\t\t\t}\r\n\t\t\t});\r\n\t\t});\r\n<\/script><\/pre>\n<style>\r\n\t\t* {\r\n\t\t\tmargin: 0;\r\n\t\t\tpadding: 0;\r\n\t\t\tborder: 0;\r\n\t\t}\r\n\r\n\t\t#main {\r\n\t\t\twidth: 960px;\r\n\t\t\theight: 1500px;\r\n\t\t\tborder: 1px solid #000;\r\n\t\t\tmargin: 0 auto;\r\n\t\t\toverflow: hidden;\r\n\t\t}\r\n\r\n\t\t#pageTop {\r\n\t\t\tposition: fixed;\r\n\t\t\tbottom: 0;\r\n\t\t\tleft: 50%;\r\n\t\t\twidth: 55px;\r\n\t\t\theight: 55px;\r\n\t\t\tmargin-left: 425px;\r\n\t\t\tbackground-image: url(image\/arrow.png);\r\n\t\t\tbackground-size: cover;\r\n\t\t}\r\n\r\n\t\t#pageTop a {\r\n\t\t\tdisplay: block;\r\n\t\t\twidth: 100%;\r\n\t\t\theight: 100%;\r\n\t\t}\r\n<\/style><\/pre>\n<div id=\"main\">\r\n\t<div id=\"pageTop\">\r\n\t\t<a href=\"#\"><\/a>\r\n\t<\/div>\r\n<\/div><\/pre>\n