Cannot read property 'childNodes' of undefined

"Cannot read property 'childNodes' of undefined"这个错误通常表示在访问某个对象的属性或方法时，该对象是undefined。这可能是由于变量未被正确初始化，或者变量指向了一个不存在的对象。要解决这个问题，你可以检查对象是否已经正确初始化，并确保变量指向的是一个有效的对象。另外，还可以使用条件语句或null检查来避免访问undefined的属性。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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