重复n次函数后失效

"use strict";
function c() {
    console.log(1);
}

function repeat(fn, times) {
    fn.times = times;
    return function() {
        if (fn.times) {
            fn.times--;
            return fn();
        } else {
            throw "err";
        }
    }
}
var foo = repeat(c, 3);
foo();
foo();
foo();
foo();
foo();
foo();