策略模式的JS实现

    var S = function (salary) {
        return salary * 4;
    };
    var A = function (salary) {
        return salary * 3;
    };
    var B = function (salary) {
        return salary * 2;
    };
    var calculateBonus = function (func, salary) {
        return func(salary);
    };

    calculateBonus(S, 10000);