未捕获的类型错误:javascript 中的非法调用 [英] Uncaught TypeError: Illegal invocation in javascript

问题描述

我正在创建一个使用具体参数执行第二个函数的 lambda 函数.此代码在 Firefox 中有效但在 Chrome 中无效，其检查器显示一个奇怪的错误，Uncaught TypeError: Illegal invocation.我的代码有什么问题?

I'm creating a lambda function that executes a second function with a concrete params.This code works in Firefox but not in Chrome, its inspector shows a weird error, Uncaught TypeError: Illegal invocation. What's wrong of my code?

var make = function(callback,params){
    callback(params);
}

make(console.log,'it will be accepted!');

推荐答案

控制台的日志函数期望 this 引用控制台(内部).考虑复制您的问题的这段代码:

The console's log function expects this to refer to the console (internally). Consider this code which replicates your problem:

var x = {};
x.func = function(){
    if(this !== x){
        throw new TypeError('Illegal invocation');
    }
    console.log('Hi!');
};
// Works!
x.func();

var y = x.func;

// Throws error
y();

这是一个可以工作的(愚蠢的)例子，因为它在你的 make 函数中将 this 绑定到 console:

Here is a (silly) example that will work, since it binds this to console in your make function:

var make = function(callback,params){
    callback.call(console, params);
}

make(console.log,'it will be accepted!');

这也行

var make = function(callback,params){
    callback(params);
}

make(console.log.bind(console),'it will be accepted!');

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