方法检测.js

let obj = {
    pickyMethodOne: function (obj, str, num) { /* ... */ },
    pickyMethodTwo: function (num, obj) { /*... */ }
};
const argTypes = {
    pickyMethodOne: ["object", "string", "number"],
    pickyMethodTwo: ["number", "object"]
};
obj = new Proxy(obj, {
    get: function (target, key, proxy) {
        var value = target[key];
        return function (...args) {
            //console.log(args)
            var checkArgs = argChecker(key, args, argTypes[key]);
            return Reflect.apply(value, target, args);
        };
    }
});

function argChecker(name, args, checkers) {
    if (args.length < checkers.length) {
        console.warn('parameters count incorrect.')
    }
    for (var idx = 0; idx < args.length; idx++) {
        var arg = args[idx];
        var type = checkers[idx];
        if (!arg || typeof arg !== type) {
            console.warn(`You are incorrectly implementing the signature of ${name}. Check param ${idx + 1}`);
        }
    }
}
obj.pickyMethodOne();
obj.pickyMethodTwo("wopdopadoo", {});