console call的fallback console 兼容

(function() {

    var noop = function noop() {};

    var methods = [

        'assert', 'clear', 'count', 'debug', 'dir', 'dirxml', 'error',

        'exception', 'group', 'groupCollapsed', 'groupEnd', 'info', 'log',

        'markTimeline', 'profile', 'profileEnd', 'table', 'time', 'timeEnd',

        'timeStamp', 'trace', 'warn'

    ];

    var length = methods.length;

    var console = window.console || {};

    while (length--) {

        // Only stub undefined methods.

        console[methods[length]] = console[methods[length]] || noop;

    }

}());

HTML5 Boilerplate默认一个处理所有的console call的fallback。
以下摘自：https://github.com/h5bp/html5-boilerp...