7. The Global Object
In Chapter 5, you learned that all functions execute in a context that you can refer to with the this keyword. A simple function executed normally runs in the global context. In a browser, the global object is window.
When you learned about variable scope in Chapter 5, you learned that variables outside of functions are in the global scope. In fact, declaring a variable in the global scope is the same as making a property on the global object.
In Chapter 2, you learned about a few global functions such as isNaN() and parseInt() ...
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