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　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。 . Prv8 Shell

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Current File : /home/rainic/public_html/setupTZh/betheme/js/parallax/translate3d.js

/**
 * Parallax
 *
 * Translate3d
 * 1.0 | Muffin Group
 */

var mfnSetup = {
  translate: null
};

(function($) {

  /* globals jQuery */

  "use strict";

  /**
   * mfnSetup
   */

  // has3d

  var has3d = function() {

    if (!window.getComputedStyle) {
      return false;
    }

    var el = document.createElement('div'),
      has3d;

    document.body.insertBefore(el, null);

    if (el.style.transform !== undefined) {
      el.style.transform = "translate3d(1px,1px,1px)";
      has3d = window.getComputedStyle(el).getPropertyValue('transform');
    }

    document.body.removeChild(el);

    return (has3d !== undefined && has3d !== null && has3d.length > 0 && has3d !== "none");
  };

  // __construct

  var __construct = function() {

    if (has3d()) {

      mfnSetup.translate = function(el, x, y) {
        el.css('transform', 'translate3d(' + x + ', ' + y + ', 0)');
      };

    } else {

      mfnSetup.translate = function(el, x, y) {
        el.css({
          "left": x,
          "top": y
        });
      };

    }
  };

  __construct();

})(jQuery);

(function($) {

  "use strict";

  /**
   * $.fn.mfnParallax
   */

  $.fn.mfnParallax = function() {

    var el = $(this),
      parent = el.parent(),
      speed = 500,
      element, parentPos, windowH;

    // imageSize

    var imageSize = function(img) {

      var w, h, l, t; // width, height, left, top

      var imageW = img.get(0).naturalWidth;
      var imageH = img.get(0).naturalHeight;

      var parentW = img.parent().outerWidth();
      var parentH = img.parent().outerHeight();

      var windowH = $(window).height();

      // fix for small sections
      if (windowH > parentH) {
        parentH = windowH;
      }

      var diff = imageW / parentW;

      if ((imageH / diff) < parentH) {

        w = imageW / (imageH / parentH);
        h = parentH;

        if (w > imageW) {

          w = imageW;
          h = imageH;

        }

      } else {

        w = parentW;
        h = imageH / diff;

      }

      l = (parentW - w) / 2;
      t = (parentH - h) / 2;

      return [w, h, l, t];
    };

    // parallax

    var parallax = function() {

      var scrollTop = $(window).scrollTop(),
        scrollDiff, ratio, translateTop;

      if (parentPos !== undefined) {

        if (scrollTop >= parentPos.min && scrollTop <= parentPos.max) {

          scrollDiff = scrollTop - parentPos.min;
          ratio = scrollDiff / parentPos.height;

          translateTop = windowH + (ratio * speed) - scrollDiff - (speed * (windowH / parentPos.height));

          mfnSetup.translate(el, element.left + "px", -Math.round(translateTop) + "px");
        }

      }
    };

    // init

    var init = function() {

      windowH = $(window).height();

      var initElement = function() {

        var size = imageSize(el);

        el.removeAttr('style').css({
          'width': size[0],
          'height': size[1]
        });

        mfnSetup.translate(el, size[2] + "px", size[3] + "px");

        return {
          'width': size[0],
          'height': size[1],
          'left': size[2],
          'top': size[3]
        };
      };

      element = initElement();

      var initParent = function() {

        var min = parent.offset().top - $(window).height();
        var max = parent.offset().top + $(parent).outerHeight();

        return {
          'min': min,
          'max': max,
          'height': max - min
        };
      };

      parentPos = initParent();

      // hide section background image
      parent.css('background-image','unset');
    };

    // reload

    var reload = function() {

      setTimeout(function() {
        init();
        parallax();
      }, 50);

    };

    reload();

    /**
     * $(window).scroll
     */

    $(window).on('scroll', parallax);

  };

  /**
   * $(window).load
   */

  $(window).on('load resize', function(){

    if ($(".mfn-parallax").length) {

      $(".mfn-parallax").each(function() {
        $(this).mfnParallax();
      });

    }

  });

})(jQuery);

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