javascript - 如何创建公共(public)和私有(private)成员？

Question

我有点困惑，如何创建公共(public)和私有(private)成员。

到目前为止我的代码模板是这样的:

(function()){
   var _blah = 1;

   someFunction = function() {
     alert(_blah);
   };

   someOtherFunction = function() {
     someFunction();
   }
}();

Answer 1

您可能想要使用 Yahoo Module Pattern :

myModule = function () {

    //"private" variables:
    var myPrivateVar = "I can be accessed only from within myModule."

    //"private" method:
    var myPrivateMethod = function () {
        console.log("I can be accessed only from within myModule");
    }

    return {
        myPublicProperty: "I'm accessible as myModule.myPublicProperty."

        myPublicMethod: function () {
            console.log("I'm accessible as myModule.myPublicMethod.");

            //Within myProject, I can access "private" vars and methods:
            console.log(myPrivateVar);
            console.log(myPrivateMethod());
        }
    };
}();

您在定义 myPrivateVar 和 myPrivateMethod 的地方定义私有(private)成员，在定义 myPublicProperty 和 myPublicMethod 的地方定义公共(public)成员> 已定义。

您可以按如下方式简单地访问公共(public)方法和属性:

myModule.myPublicMethod();    // Works
myModule.myPublicProperty;    // Works
myModule.myPrivateMethod();   // Doesn't work - private
myModule.myPrivateVar;        // Doesn't work - private