Only To Learn Reference 仅供学习参考
When no nested functions are involved, the scope chain is the only reference to the call object.
如果不涉及到内嵌函数，这个作用域链是唯一引用到调用对象的。
If the nested function is used only within the outer function, however, the only reference to the nested function is in the call object.
如果内嵌函数只是在外部函数中使用到，那么对内嵌函数的唯一引用就是调用对象自己。
His only reference to the past was to tell me, with a wonderful sparkle in his eye, that he was only able to get eight quail out of the ten shots the day before.
他双眼熠熠闪光的告诉我，他仅仅记得过去的一件事，那就是在前天他十枪打中八只鹌鹑。
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