How can I disable the HTML textfield using this simple jQuery?

I have this simple jQuery code to test out.
Basically the HTML page comes with a simple button and textfield. All I want to have the input field disabled as I click the button. But it doesn't work??? (PS: this code is sourced out from w3schools.com website, just to simply test out how powerful jQuery is)
That explains why W3School isn't appreciated over here. the HTML isn't valid. look at that text element...

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