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Manual mode, can pursue the hazy feeling of virtual focus陈启，让我来写。What is DDoS?起不了床？读书记不住？你被烦恼星人入侵啦！ 根据宇宙最强大脑女娃博士的追踪研究，原来人类的烦恼不全是天生的， 可能是由负能量体烦恼星人制造出来的！想要打败负能量，就要依靠正能量， 于是女娃博士就以勇气与快乐为元素，创造出了超迷你战士--迷你勇与迷你萌！ 他们以超迷你的体型打败可恶的烦恼星人，让人们重新过上幸福的生活～ 你，是不是也有数不清的烦恼？快呼叫超迷你战士！！！1. The registerForm.onsubmit function is relatively large, and the code contains many if statements;In the above code, we use three functions, order500, order200, orderNormal to handle its own business logic, If the current own function cannot handle things, We pass it to the following function to handle it. By analogy, Until there is a function that can handle him, Otherwise, the responsibility chain mode will leave the chain directly, telling that it cannot be processed and throwing an error prompt. Although the above code can be used as the responsibility chain mode, we can see from the above code that the Order500 function depends on functions such as Order200, so there must be this function, which also violates the open-closed principle in object-oriented. Let's continue to understand writing flexible and detachable responsibility chain nodes.