晋太元中,武陵人捕鱼为业。缘溪行,忘路之远近。忽逢桃花林,夹岸数百步,中无杂树,芳草鲜美,落英缤纷。渔人甚异之,复前行,欲穷其林。 林尽水源,便得一山,山有小口,仿佛若有光。便舍船,从口入。初极狭,才通人。复行数十步,豁然开朗。土地平旷,屋舍俨然,有良田、美池、桑竹之属。阡陌交通,鸡犬相闻。其中往来种作,男女衣着,悉如外人。黄发垂髫,并怡然自乐。 见渔人,乃大惊,问所从来。具答之。便要还家,设酒杀鸡作食。村中闻有此人,咸来问讯。自云先世避秦时乱,率妻子邑人来此绝境,不复出焉,遂与外人间隔。问今是何世,乃不知有汉,无论魏晋。此人一一为具言所闻,皆叹惋。余人各复延至其家,皆出酒食。停数日,辞去。此中人语云:“不足为外人道也。”(间隔 一作:隔绝) 既出,得其船,便扶向路,处处志之。及郡下,诣太守,说如此。太守即遣人随其往,寻向所志,遂迷,不复得路。 南阳刘子骥,高尚士也,闻之,欣然规往。未果,寻病终。后遂无问津者。
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(function($) {
$.fn.sadropdown = function(options) {
var settings = $.extend({
relativeTo : "body"
}, options);
var win = $(window);
return this.each(function() {
$(this).on('click', function() {
var droptrgr = $(this);
var dropdn = $(this).next(".dropdown-menu");
var boundry = (settings.relativeTo!=="body") ? $(this).closest(settings.relativeTo) : $("body");
var winHeight = win.height();
var viewportOffset = droptrgr.offset().top - win.scrollTop();
var dropdownHeight = dropdn.outerHeight() + droptrgr.outerHeight();
var dropupArea = winHeight - dropdownHeight;
var boundryht = boundry.outerHeight();
var boundryOffset = droptrgr.offset().top - boundry.offset().top;
var dropArea = boundryht - dropdownHeight;
if (viewportOffset > dropupArea || boundryOffset > dropArea) {
dropdn.css({top: "auto", bottom: "45%"});
} else {
dropdn.css({bottom: "auto", top: "100%"});
}
});
});
};
}(jQuery));