Better Baidu 百度优化

删除搜索结果页面右侧内容框，并添加“Bing必应”与“Google”搜索链接。同时高亮搜索关键字（试验性）。Remove the 'right' contents. Add Bing and Google search buttons. Highlight search results.
当前为 2015-09-06 提交的版本，查看最新版本。
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// ==UserScript==
// @name        Better Baidu 百度优化
// @namespace   feifeihang.info
// @description 删除搜索结果页面右侧内容框，并添加“Bing必应”与“Google”搜索链接。同时高亮搜索关键字（试验性）。Remove the 'right' contents. Add Bing and Google search buttons. Highlight search results.
// @include     http://www.baidu.com/
// @include     https://www.baidu.com/
// @include     http://www.baidu.com/s*
// @include     https://www.baidu.com/s*
// @version     1
// @grant       none
// ==/UserScript==
(function (window, document, undefined) {
  var hasAdded = false;
  // define search engines' urls.
  var URLS = {
    'Bing': 'http://www.bing.com/search?q=',
    'Google': 'http://www.google.com/#q='
  };
  window.addEventListener('load', function () {
    // now, let's go implement keywords highlighting.
    var resultContainerQuery = '#content_left';
    var buffer = '';
    watch(resultContainerQuery, buffer);
  }, false);
  var COLORS = [
    '#FFFF00',
    '#FFCC00',
    '#CCCCFF',
    '#00CCFF',
    '#33CCCC',
    '#FF8080',
    '#008000',
    '#FFFF99',
    '#808000',
    '#FFFFCC'
  ];
  var counter = 0;
  function watch(resultContainerQuery, buffer) {
    setInterval(function () {
      // first, remove the annoying right contents.
      if (document.querySelector('#content_right')) {
        document.querySelector('#content_right').remove();
      }
      // if Bing and Google are not added yet, add them.

      var isNotBaiduHomepage = 
          window.location.href.toUpperCase() !== 'HTTP://WWW.BAIDU.COM' &&
          window.location.href.toUpperCase() !== 'HTTPS://WWW.BAIDU.COM' &&
          window.location.href.toUpperCase() !== 'HTTP://WWW.BAIDU.COM/' &&
          window.location.href.toUpperCase() !== 'HTTPS://WWW.BAIDU.COM/';
      if (!hasAdded && isNotBaiduHomepage) {
        // find container and Baidu button.
        var container = document.querySelector('#form');
        var baidu = document.querySelector('#su').parentElement;
        var current = baidu;
        // now, create and add new buttons.
        for (var item in URLS) {
          var q = document.querySelector('#kw').value || '';
          var anchor = document.createElement('a');
          anchor.innerHTML = item;
          anchor.setAttribute('href', URLS[item] + q);
          anchor.style = 'color: rgb(255, 255, 255);font-weight: bold; display: inline-block;' +
          'text-decoration: none;background: rgb(51, 133, 255) none repeat scroll 0% 0%; text-align: center; line-height: 33px;' +
          'margin-left: 2px; width: 60px; height: 33px; border-bottom: 1px solid transparent;';
          container.insertBefore(anchor, current.nextSibling);
          current = anchor;
        }
        hasAdded = true;
      }
      var resultContainer = document.querySelector(resultContainerQuery);
      if (resultContainer && resultContainer.textContent !== buffer) {
        // update buffer.
        buffer = resultContainer.textContent;
        // first, find all 'em's.
        var ems = document.querySelectorAll('em');
        // if there is no 'em's, do nothing.
        if (ems.length === 0) {
          return false;
        }
        // convert ems into an array.

        ems = Array.prototype.slice.apply(ems);
        var counter = 0;
        // get keywords.
        var keywords = document.querySelector('#kw').value.trim().split(' ').map(function (item) {
          return item.toUpperCase().trim()
        });
        var styles = {
        };
        // assign a color to each keyword.
        keywords.forEach(function (item, index) {
          if (styles[item] === undefined) {
            styles[item] = COLORS[counter++];
            if (counter === COLORS.length) {
              counter = 0;
            }
          }
        });
        // iterate through all the keywords in search result, 
        // and map the predefined color to them.
        ems.forEach(function (em) {
          var text = em.innerHTML.toUpperCase().trim();
          em.style.background = styles[text] || '';
          em.style.color = '#000';
          em.style.fontWeight = 'bold';
        });
      }
    }, 1000);
  }
}) (this, document);
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