if (window.console && 'function' === typeof window.console.log) {
    window.console.log(o);
}

更好的退路是:

   var alertFallback = true;
   if (typeof console === "undefined" || typeof console.log === "undefined") {
     console = {};
     if (alertFallback) {
         console.log = function(msg) {
              alert(msg);
         };
     } else {
         console.log = function() {};
     }
   }

对于没有控制台的浏览器来说，最好的解决方案是:

// Avoid `console` errors in browsers that lack a console.
(function() {
    var method;
    var noop = function () {};
    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 = window.console || {});

    while (length--) {
        method = methods[length];

        // Only stub undefined methods.
        if (!console[method]) {
            console[method] = noop;
        }
    }
}());

这是我的“IE，请不要崩溃”

typeof console=="undefined"&&(console={});typeof console.log=="undefined"&&(console.log=function(){});

我真的很喜欢“orange80”发布的方法。它很优雅，因为你可以设置一次，然后忘记它。

其他方法要求您做一些不同的事情(每次调用console.log()以外的东西)，这只是在自找麻烦……我知道我最终会忘记。

我更进一步，通过将代码包装在一个实用函数中，您可以在javascript的开头调用一次，只要是在任何日志记录之前。(我正在我公司的事件数据路由器产品中安装这个。这将有助于简化新管理界面的跨浏览器设计。)

/**
 * Call once at beginning to ensure your app can safely call console.log() and
 * console.dir(), even on browsers that don't support it.  You may not get useful
 * logging on those browers, but at least you won't generate errors.
 * 
 * @param  alertFallback - if 'true', all logs become alerts, if necessary. 
 *   (not usually suitable for production)
 */
function fixConsole(alertFallback)
{    
    if (typeof console === "undefined")
    {
        console = {}; // define it if it doesn't exist already
    }
    if (typeof console.log === "undefined") 
    {
        if (alertFallback) { console.log = function(msg) { alert(msg); }; } 
        else { console.log = function() {}; }
    }
    if (typeof console.dir === "undefined") 
    {
        if (alertFallback) 
        { 
            // THIS COULD BE IMPROVED… maybe list all the object properties?
            console.dir = function(obj) { alert("DIR: "+obj); }; 
        }
        else { console.dir = function() {}; }
    }
}

我使用沃尔特的方法从上面(见:https://stackoverflow.com/a/14246240/3076102)

我在这里找到了一个解决方案https://stackoverflow.com/a/7967670来正确地显示对象。

这意味着trap函数变成:

function trap(){
    if(debugging){
        // create an Array from the arguments Object           
        var args = Array.prototype.slice.call(arguments);
        // console.raw captures the raw args, without converting toString
        console.raw.push(args);
        var index;
        for (index = 0; index < args.length; ++index) {
            //fix for objects
            if(typeof args[index] === 'object'){ 
                args[index] = JSON.stringify(args[index],null,'\t').replace(/\n/g,'<br>').replace(/\t/g,'&nbsp;&nbsp;&nbsp;');
            }
        }
        var message = args.join(' ');
        console.messages.push(message);
        // instead of a fallback function we use the next few lines to output logs
        // at the bottom of the page with jQuery
        if($){
            if($('#_console_log').length == 0) $('body').append($('<div />').attr('id', '_console_log'));
            $('#_console_log').append(message).append($('<br />'));
        }
    }
} 

我希望这对你有帮助:-)