// This example is from the book _JavaScript: The Definitive Guide_. // Written by David Flanagan. Copyright (c) 1996 O'Reilly & Associates. // This example is provided WITHOUT WARRANTY either expressed or implied. // You may study, use, modify, and distribute it for any purpose. // This is a function. It uses the this keyword, so // it doesn't make sense to invoke this function by itself; it // needs instead be made a method of some object, some object that has // "width" and "height" properties defined. function compute_area() { return this.width * this.height; } // Create a new Rectangle object, using the constructor defined earlier var rect =index.html new Rectangle(8.5, 11); // Define a method by assigning the function to a property of the object rect.area = compute_area; // Invoke the new method like this: a = rect.area(); // a = 8.5*11 = 93.5
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