Javascript返回奇怪的价值

我正在测试一个函数，看看当它的参数是 null 时会发生什么，并决定用它添加一个else语句。令我惊讶的是，它没有记录我通过的参数，它完全记录了其他内容。也许有人可以对此有所了解，这里是代码：

I was testing a function out to see what happens when it's parameters are null and decided to put an else statement with it. To my surprise, it did not log the parameters that I have passed, it's logging something else entirely. Maybe someone can shed some light on this, here's the code:

function testing(o) {
    if (!o) {
        return "Sorry, looks like you need to pass an argument.."
    } else {
        return o;
    }
}

console.log(testing(02034));
//logs 1052

这里发生了什么？