OOP Javascript'这'嵌套私有方法中的关键字

下面是一些示例代码：

ExampleClass = function()
{
    this.initiate();
};
ExampleClass.prototype.initiate = function()
{
    var connect = function()
    {
        this.sendNOP();
    };
    connect();
};
ExampleClass.prototype.sendNOP = function()
{
    console.info('Sending NOP...');
    var callback = function()
    {
        console.info('Server responded to NOP. ZzzZzzzZzz...');
    };
    setTimeout(callback, 1500);
};

我很好奇为什么我不能在ExampleClass.initiate中调用this.sendNOP()，以便ExampleClass.initiate._connect()将ExampleClass的实例作为this传递给ExampleClass.sendNOP()，似乎将window作为this传递。为什么？

编辑：

问题是，当我们调用ExampleClass.initiate._connect()时，我们只使用不指定任何上下文的connect()。用.apply(this)调用ExampleClass.initiate._connect()有效！CCD_ 13将上下文设置为CCD_。

ExampleClass.prototype.appliedInitiate = function()
{
    var connect = function()
    {
        this.sendNOP();
    };
    connect.apply(this);
};

最终代码

ExampleClass = function()
{  
    this.appliedInitiate();
};
ExampleClass.prototype.sendNOP = function()
{
    console.info('Sending NOP...');
    var callback = function()
    {
        console.info('Server responded to NOP. ZzzZzzzZzz...');
    };
    setTimeout(callback, 1500);
};
ExampleClass.prototype.initiate = function()
{
    var connect = function()
    {
        this.sendNOP();
    };
    connect(); // Won't work. connect() is not called from any context (ie. obj.connect() )
};
ExampleClass.prototype.appliedInitiate = function()
{
    var connect = function()
    {
        this.sendNOP();
    };
    connect.apply(this); // Will work, we are calling connect with apply, which sets the context to ExampleClass
};