1.js报错解决办法
这个一般是你获取的节点不存在引起的。
可能出现这种情况的原因:你获取这节点时,节点还没加载,例如:你的JS写在head里面,取body里面的某一节点,这时候是取不到的。这种情况的解决方法:把JS代码放到后面
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