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如果函数没有参数,则两个括号并在一起,如果有则,左右保留半个空格
for循环,如果元素为元素节点则命名为el,为普通节点(或夹杂其他类型节点)命名为node, 其他情况为item,序号则用i, j, k
函数中没有用到的参数名命名为_
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