Google+ Timetable

gplus.timetable.user.js

/*
    Google+ Timetable => Get links of one's recent posts.
    Copyright (C) 2012 Jingqin Lynn
    
    Includes jQuery
    Copyright 2011, John Resig
    Dual licensed under the MIT or GPL Version 2 licenses.
    http://jquery.org/license

    Includes Sizzle.js
    http://sizzlejs.com/
    Copyright 2011, The Dojo Foundation
    Released under the MIT, BSD, and GPL Licenses.
    
    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.
    
*/

// ==UserScript==
// @name 		Google+ Timetable
// @namespace		http://project.quietmusic.org/2012/userscript/gplus/
// @description		Get links of one's recent posts.
// @match		https://plus.google.com/*
// ==/UserScript==

(function (name, url, main) {
  'use strict';
  //Use the <base> element to detect Google+ main page.
  var base = document.querySelector('base');
  if (!base || !base.href.match(/^https:\/\/plus\.google\.com(\/u\/\d+)?\/?/)) return;
  
  var win = window;
  if (typeof(unsafeWindow) != 'undefined') {
    //Chrome V8 don't support unsafeWindow. Time for a hack.
    if (window == unsafeWindow) {
        var span = document.createElement('span');
        span.setAttribute('onclick', 'return window;');
        unsafeWindow =  span.onclick();
    }
    win = unsafeWindow;
  }
  if (win.DependencyLoader.dependencyState(name) == win.DependencyLoader.Dependency.LOADING) {
    main();
  } else {
    var dependencies = [
      { 'jQuery.gplus' : 'https://gist.github.com/raw/2645666/jquery.gplus.js' }
    ];
    var me = {}; me[name] = url;
    dependencies.push(me);
    win.DependencyLoader.requireOrdered(dependencies,
      null, function () {
        win.DependencyLoader.require(name, main);
      }
    );
  }
})(
  'org.quietmusic.project.gplus.timetable', 
  'https://gist.github.com/raw/1578029/gplus.timetable.user.js',
  function () {
    'use strict';
    var $ = window.jQuery;
    
    $.gplus.page().dynamicSelect('profileNameContainer', function (n) {
      n.append($("<input/>").attr("type", "button").val("T").click(function () {
        var months = {};
        
        $.gplus.page().find('postDateTime').eachElement(function (e) {
          var link = e[0].href.replace(
            /https:\/\/plus\.google\.com\/u\/\d+/,
            "https://plus.google.com"
          );
          var date = e.publishDate();
          var month = date.getMonth() + 1;
          var day = date.getDate();
          
          var days = months[month]
          if(!days) days = months[month] = {};
          var posts = days[day]
          if(!posts) posts = days[day] = [];
          posts.push(link);
        });
        
        var div = $('<div/>').css({
          'position' : 'fixed',
          'z-index' : '99999999',
          'top' : '0',
          'left' : '0',
          'width' : '100%',
          'height' : '100%',
          'background-color' : 'white',
        });
        
        for (var m in months) {
          var tbody = $("<tbody/>");
          var table = $("<table/>").append(tbody);
          for (var d in months[m]) {
            var cell1 = $("<td/>").css("border-width", "1px").css("border-style", "solid").css("min-width", "30px");
            cell1.text(d);
            var cell2 = $("<td/>").css("border-width", "1px").css("border-style", "solid");
            var tr = $("<tr/>").append(cell1).append(cell2);
            var posts = months[m][d];
            for (var i = 0; i < posts.length; i++) {
              var a = $("<a/>");
              a.attr("href", posts[i]).text(posts[i]);
              cell2.append(a);
              cell2.append($("<br/>"));
            }
            table.append(tr);
          }
          var p = $("<p/>");
          p.text(m + "月");
          div.append(p).append(table);
        }
        
        div[0].addEventListener('contextmenu', function (e) {
          if (!e) e = window.event;
          e.preventDefault();
          div.remove();
        }, false);
        div.appendTo('body');
      }));
    });
  });

function的参数$和_是什么意思？