jQuery选择器的性能测试(4)

 /**
  * Shortcut function for benchmarking a block of code to the Firebug console
  * this function will run your code in a for block to create overflow and push the results into Firebug
  *
  * @param string benchmarkCode - the block of code you want to benchmark
  * @param numeric testTime - the number of FOR cicles
  */
 $.extend($, {
        bm: function (benchmarkCode, testTime) {
            this.testTime = typeof testTime === 'number' ? testTime : 9999;
            $.lt();
            for (var i = 0;i < this.testTime;i++) {
                eval(benchmarkCode);
            }
            $.lt();
        }
 });
       
    /**
     * Mock ajax requests with a prefilter
     *
     */
    $.extend($, {
        mockAjax: function (mockOptions) {
            mockOptions = $.extend({
                mockUrl: '/ajax_mocks'
            }, mockOptions);
            $.ajaxPrefilter(function(options, originalOptions, jqXHR) {
                if (!options.noMock) {
                    options.url = mockOptions.mockUrl + '?ajax_url=' + encodeURIComponent(options.url);
                }