javascript一种比较通用的继承过程

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<script>
    function Person(name, gender) {
        this.name = name;
        this.gender = gender;
    }
    Person.prototype.showName = function() {
        alert(this.name);
    }
    Person.prototype.showGender =function() {
        alert(this.gender);
    }
　　
    function Worker(name, gender, job) {
　　　　　　　// Step1
        Person.call(this, name, gender);
        this.job = job;
    }
　　　// Step2
    for (var i in Person.prototype) {
        Worker.prototype[i] = Person.prototype[i];
    }
    Worker.prototype.showJob = function() {
        alert(this.job);
    }
    var oW1 = new Worker("hello", "male", "coder");
    oW1.showJob();
</script>