报错 Uncaught TypeError: Cannot read property ‘appendChild’ of null
原因:是由于获取不到插入的节点
出现这种情况的原因：获取节点时，节点还没加载
如：js写在head里面，取body里面的某一节点，这时候是取不到的。即该js的作用域
在head以
解决方法：把JS代码放到后面
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