Js 关于console 在IE 下的兼容问题

 1 (function() {
 2     var method;
 3     var noop = function () {};
 4     var methods = [
 5         ‘assert‘, ‘clear‘, ‘count‘, ‘debug‘, ‘dir‘, ‘dirxml‘, ‘error‘,
 6         ‘exception‘, ‘group‘, ‘groupCollapsed‘, ‘groupEnd‘, ‘info‘, ‘log‘,
 7         ‘markTimeline‘, ‘profile‘, ‘profileEnd‘, ‘table‘, ‘time‘, ‘timeEnd‘,
 8         ‘timeline‘, ‘timelineEnd‘, ‘timeStamp‘, ‘trace‘, ‘warn‘
 9     ];
10     var length = methods.length;
11     var console = (window.console = window.console || {});
12 
13     while (length--) {
14         method = methods[length];
15 
16         // Only stub undefined methods.
17         if (!console[method]) {
18             console[method] = noop;
19         }
20     }
21 }());