console.log不是nodejs 6.9.1中的函数 [英] console.log is not a function in nodejs 6.9.1

问题描述

当我尝试理解Javascript中的代码时，我遇到了一个奇怪的问题：好的部分。我尝试使用console.log（）打印一些东西，但我得到TypeError，我的代码在这里：

I met a weird problem when I try to understand the code in the Javascript:The Good Parts. I try to use console.log() to print something, but I just get TypeError, my code is here:

Function.prototype.method=function(name,func){
    this.prototype[name]=func;
    return this;
}

Function.method('bind',function(that){
    var method=this;
    var slice =Array.prototype.slice;
    var args=slice.apply(arguments,[1]);

    console.log(that);//error: console.log is not a function

    return function(){
        return method.apply(that,args.concat(slice.apply(arguments,[0])));
    };
});

var x=function(){
    return this.value;
}.bind({value:666});

console.log(x());

并且错误消息是：

/home/wz/code/js/c.js:14
    console.log(that);//error: console.log is not a function
            ^

TypeError: console.log is not a function
    at Function.<anonymous> (/home/wz/code/js/c.js:14:13)
    at new Console (console.js:34:23)
    at console.js:100:18
    at NativeModule.compile (bootstrap_node.js:497:7)
    at Function.NativeModule.require (bootstrap_node.js:438:18)
    at get (bootstrap_node.js:254:34)
    at Function.<anonymous> (/home/wz/code/js/c.js:14:5)
    at Object.<anonymous> (/home/wz/code/js/c.js:23:3)
    at Module._compile (module.js:570:32)
    at Object.Module._extensions..js (module.js:579:10)

Shell 已返回1

它是有趣的是，当我在stackoverflow中运行代码段时，它按预期工作...所以似乎我的原生环境中有一些错误？

It is so interesting when I run the snippet in stackoverflow it works as I expected... So it seems that there are some bugs in my native environment?

我尝试使用fs将console.log保存到文件中以查看我的代码中实际存在的内容，我将代码更改为：

I try to use fs to save the console.log into file to see what actually it is in my code, I change the code to:

fs=require('fs');
Function.prototype.method=function(name,func){
    this.prototype[name]=func;
    return this;
}

Function.method('bind',function(that){
    var method=this;
    var slice =Array.prototype.slice;
    var args=slice.apply(arguments,[1]);

    fs.writeFile('a.txt',String(console.log));
    //console.log(that);//error: console.log is not a function

    return function(){
        return method.apply(that,args.concat(slice.apply(arguments,[0])));
    };
});

var x=function(){
    return this.value;
}.bind({value:666});

console.log(x());

和a.txt：

function (){
        return method.apply(that,args.concat(slice.apply(arguments,[0])));
    }

令人惊讶的是，console.log成为返回的对象...我完全是困惑。
我尝试了节点6.9.1和4.6.1，得到了相同的结果。我使用nvm来管理我的节点版本

So amazing that console.log becomes the returned object... I was totally confused. I have tried node 6.9.1 and 4.6.1 and I got the same result. And I use nvm to manage my node version

推荐答案

你覆盖 console 你代码中的某个地方。为避免 Monkey修补，您可以使用构造：

You override console somewhere in your code. For avoid Monkey patching you can use construction:

console.log = console.log || function（message）{alert（message）;};

使用这种结构，你不会覆盖现有的功能，只添加新的方法或礼节。

With this construction you will not override existing functionality, only add new method or proprieties.

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