解决IE8不支持console

解决IE8不支持console,代码中包含console时会报错。

//解决 IE8 不支持console
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;
})();