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---Body section---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.板栗失笑道：这真是稀奇。再者，王相还在外面等候王爷呢。以前做事情，心里都是有谱的。As a result, an exception occurred when newChannel was used, and a FailedChannel was returned after catch, while the outside call thought that it must be a DatagramChannel.