伪造toString

(() => {
    const $toString = Function.toString;
    const myFunction_toString_symbol = Symbol('('.concat('', ')_', (Math.random() + '').toString(36)));
    const myToString = function () {
        return typeof this == 'function' && this[myFunction_toString_symbol] || $toString.call(this);
    };


    function set_native(func, key, value) {
        Object.defineProperty(func, key, {
            "enumerable": false,
            "configurable": true,
            "writable": true,
            "value": value
        })
    }

    delete Function.prototype['toString'];

    set_native(Function.prototype,"toString",myToString);

    set_native(Function.prototype.toString,myFunction_toString_symbol,"function toString() { [native code] }");

    safeFunction = (func) => {
        set_native(func,myFunction_toString_symbol,`function ${func.name || ''}() { [native code] }`);
    };
}).call();

//-------------------------------------
window = function (){};
safeFunction(window);
console.log(window.toString());