自动将 console.log 添加到每个函数 [英] Adding console.log to every function automatically

问题描述

是否可以通过在某处注册全局钩子(即不修改实际函数本身)或通过其他方式调用任何函数时输出 console.log 语句?

Is there a way to make any function output a console.log statement when it's called by registering a global hook somewhere (that is, without modifying the actual function itself) or via some other means?

推荐答案

这是一种使用您选择的函数来扩充全局命名空间中的所有函数的方法:

Here's a way to augment all functions in the global namespace with the function of your choice:

function augment(withFn) {
    var name, fn;
    for (name in window) {
        fn = window[name];
        if (typeof fn === 'function') {
            window[name] = (function(name, fn) {
                var args = arguments;
                return function() {
                    withFn.apply(this, args);
                    return fn.apply(this, arguments);

                }
            })(name, fn);
        }
    }
}

augment(function(name, fn) {
    console.log("calling " + name);
});

一个缺点是在调用 augment 之后创建的函数不会有额外的行为.

One down side is that no functions created after calling augment will have the additional behavior.

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