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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.Three items are enough, we don't need any extra ones.不过就算张无忌取得‘第一，依然还要面对渡厄、渡劫、渡难三个老和尚。“潮水死了————”暗影中，板栗看不清他的表情，却感觉一阵微风袭来，也不应声，往后一仰，抬脚踢向那微风袭来的方向。