jquery.role benchmark

bm.js

            $(function(){

                var num = 100;
                var test_count = 10000;

                for(var i = 0; i < num; i++) {
                    $('body').append('<div class="c'+i+'" id="i'+i+'" role="r'+i+'" data-attr="a'+i+'">'+i+'</div>');
                }
                
                var randoms = [];
                for(var i = 0; i < test_count; i++) {
                    randoms.push(Math.round(Math.random() * (num-1)) % (num-1));
                }
                
                start = Date.now();
                for(var i = 0; i < test_count; i++) {
                    $('.c'+randoms[i]);
                }
                var class_result = Date.now() - start;
                
                start = Date.now();
                for(var i = 0; i < test_count; i++) {
                    $('#i'+randoms[i]);
                }
                var id_result = Date.now() - start;
                
                start = Date.now();
                for(var i = 0; i < test_count; i++) {
                    $('[a='+randoms[i]+']');
                }
                var attr_result = Date.now() - start;
                
                start = Date.now();
                for(var i = 0; i < test_count; i++) {
                    $('@r'+randoms[i]);
                }
                var role_result = Date.now() - start;
                
                
                start = Date.now();
                for(var i = 0; i < test_count; i++) {
                    a = $('#i'+randoms[i]).get()[0].className;
                }
                var getcn_result = Date.now() - start;
                
                start = Date.now();
                for(var i = 0; i < test_count; i++) {
                    a = $('#i'+randoms[i]).get()[0].getAttribute('role');
                }
                var getar_result = Date.now() - start;
                
                
                console.log('Class: ' + class_result);
                console.log('ID: ' + id_result);
                console.log('Attr: ' + attr_result);
                console.log('Role: ' + role_result);
                console.log('Get CN: ' + getcn_result);
                console.log('Get AR: ' + getar_result);
                
            });