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The propagation of events is directed. When a button is clicked, the event generated starts to propagate upward from the button (just like a blister comes up from the bottom of a cup, which is why it is called event bubbling), but this event always looks for whether a specific attribute has a value. For example, the click event of a button first looks for a meaningful definition of whether there is an onclick attribute on the button (i.e. The attribute points to an existing function or an executable statement), and if so, executes the function or statement; The event then continues to propagate up to the upper layer object of the button (for example, a form object or document object, which in short contains the parent object of the button). If the object also defines the onclick attribute, the value of the attribute is executed.PX: The theory is pixels. DNF does not use pixels as the range unit, but uses centimeters with a range of 100px, which is an ellipse with a short axis of 1cm and an eccentricity of 0.95 (please see the high school math textbook for ellipse courses)这就是青青青木的长评。该剧改编自秦明文学作品《法医秦明之无声的证词》，讲述了初出茅庐的天赋青年秦明（张雨剑 饰），在林当（周雨彤 饰）等人的帮助下，一步步走出童年记忆阴霾，并成长为可以把控全局的法医大神的故事。The game can be added after the machine is brushed.The module mode uses an anonymous function that returns an object. Inside this anonymous function, private variables and functions are first defined for use by internal functions, and then an object literal quantity is returned as the value of the function. The returned object literal quantity only contains properties and methods that can be exposed. In this way, external use of the method can be provided; Since the public method in the return object is defined inside the anonymous function, it can access private variables and functions inside.