{"id":1242,"date":"2010-11-11T20:44:50","date_gmt":"2010-11-11T12:44:50","guid":{"rendered":"http:\/\/www.zhangxinxu.com\/wordpress\/?p=1242"},"modified":"2018-01-01T20:48:38","modified_gmt":"2018-01-01T12:48:38","slug":"js%e9%a1%b5%e9%9d%a2%e6%bb%9a%e5%8a%a8%e6%97%b6%e5%b1%82%e6%99%ba%e8%83%bd%e6%b5%ae%e5%8a%a8%e5%ae%9a%e4%bd%8d%e5%ae%9e%e7%8e%b0jquerymootools","status":"publish","type":"post","link":"https:\/\/www.zhangxinxu.com\/wordpress\/2010\/11\/js%e9%a1%b5%e9%9d%a2%e6%bb%9a%e5%8a%a8%e6%97%b6%e5%b1%82%e6%99%ba%e8%83%bd%e6%b5%ae%e5%8a%a8%e5%ae%9a%e4%bd%8d%e5%ae%9e%e7%8e%b0jquerymootools\/","title":{"rendered":"js\u9875\u9762\u6eda\u52a8\u65f6\u5c42\u667a\u80fd\u6d6e\u52a8\u5b9a\u4f4d\u5b9e\u73b0(jQuery\/MooTools)"},"content":{"rendered":"

by zhangxinxu<\/a> from http:\/\/www.zhangxinxu.com<\/a>
\n\u672c\u6587\u5730\u5740\uff1ahttp:\/\/www.zhangxinxu.com\/wordpress\/?p=1242<\/a><\/p>\n

\u4e00\u3001\u5e94\u7528\u5c55\u793a<\/h3>\n

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\u65b9\u6cd5\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n

\n
\n$.fn.smartFloat = function() {\n    var position = function(element) {\n        var top = element.position().top, pos = element.css(\"position\");\n        $(window).scroll(function() {\n            var scrolls = $(this).scrollTop();\n            if (scrolls > top) {\n                if (window.XMLHttpRequest) {\n                    element.css({\n                        position: \"fixed\",\n                        top: 0\n                    });    \n                } else {\n                    element.css({\n                        top: scrolls\n                    });    \n                }\n            }else {\n                element.css({\n                    position: \"absolute\",\n                    top: top\n                });    \n            }\n        });\n    };\n    return $(this).each(function() {\n        position($(this));                         \n    });\n};\n<\/pre>\n<\/div>\n
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\n
$(\"#float\").smartFloat();<\/pre>\n<\/div>\n
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\n\"jQuery\u667a\u80fd\u6d6e\u52a8demo\u6548\u679c\u622a\u56fe<\/p>\n
\u56db\u3001MooTools\u4e0b\u7684\u5c42\u7684\u667a\u80fd\u6d6e\u52a8<\/h3>\n
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\n
\nvar $smartFloat = function(elements) {\n    var position = function(element) {\n        var top = element.getPosition().y, pos = element.getStyle(\"position\");\n        window.addEvent(\"scroll\", function() {\n            var scrolls = this.getScroll().y;\n            if (scrolls > top) {\n                if (window.XMLHttpRequest) {\n                    element.setStyles({\n                        position: \"fixed\",\n                        top: 0\n                    });    \n                } else {\n                    element.setStyles({\n                        top: scrolls\n                    });    \n                }\n            }else {\n                element.setStyles({\n                    position: \"absolute\",\n                    top: top\n                });    \n            }                       \n        });\n    };\n    if ($type(elements) === \"array\") {\n        return elements.each(function(items) {\n            position(items);                         \n        });\n    } else if ($type(elements) === \"element\") {\n        position(elements);    \n    }\n};\n<\/pre>\n<\/div>\n
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\n
$smartFloat($(\"float\"));<\/pre>\n<\/div>\n
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