一步一步学习TypeScript(17.Getters&Setters)

typescript支持使用get和set在访问这个变量时对其进行拦截.这使你可以更细利度的控制你的程序.
只有当口令正确的用户才可以修改用户名:

var passcode = "secret passcode";

class Employee {
    private _fullName: string;

    public get fullName(): string {
        return this._fullName;
    }

    public set fullName(newName: string) {
        if (passcode && passcode == "secret passcode") {
            this._fullName = newName;
        }
        else {
            alert("Error: Unauthorized update of employee!");
        }
    }
}

var employee = new Employee();
employee.fullName = "Bob Smith";
if (employee.fullName) {
    console.log(employee.fullName);
}

如get,set前不加修饰符时默认是public类型的.但是我觉得加上后看起来更规整,
并且TypeScript要求修饰符要一致,即get,set前要不都不加,或都加public修饰,或都为protected修饰.