window.console = window.console || (function () {
var c = {}; c.log = c.warn = c.debug = c.info = c.error = c.time = c.dir = c.profile
= c.clear = c.exception = c.trace = c.assert = function () { };
return c;
})();
//放在<script></script>的下面第一行
原文：http://www.cnblogs.com/Lcy-Sun0419/p/7844951.html