js兼容性一

一、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;
})();