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The Math object contains various math-related constants (for example, π) and functions (for example, cosine). (Note that the Math object has no constructor, unlike Array or Date. All its methods are "static", that is "class" methods.) All the trigonometric functions use angles expressed in radians, not degrees or grads.
@returns: Documents a return value @return: Synonym for @returns: @see: Documents an association to another object @todo: Documents something that is missing/open @this: Specifies the type of the object to which the keyword this refers within a function. @throws: Documents an exception thrown by a method @version: Provides the version number of ...
While you can write a script directly in your common.js page or skin.js (such as vector.js) page, it is usually better to create a new subpage for it in the form YourUserName/title.js, where title is the name of your script.
Form, link and image elements could be referenced with a hierarchical name that began with the root document object. A hierarchical name could make use of either the names or the sequential index of the traversed elements. For example, a form input element could be accessed as either document.myForm.myInput or document.forms[0].elements[0].
Don't copy JavaScript or any other code from an unprotected page, since someone may have tampered with it. Figure 21-2. The script at the page Wikipedia:WikiProject User scripts/Scripts/User tabs has three full lines of comment (two at the top, one at the bottom); these have two slashes at the beginning. The actual code that will be executed is ...
Example one shows how narrative text can be interspersed with testable examples in a docstring. In the second example, more features of doctest are shown, together with their explanation. Example three is set up to run all doctests in a file when the file is run, but when imported as a module, the tests will not be run.
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A method is a behavior of an object parametrized by a user. Data is represented as properties of the object, and behaviors are represented as methods. For example, a Window object could have methods such as open and close, while its state (whether it is open or closed at any given point in time) would be a property.