Uncaught TypeError: Cannot read properties of null (reading '0')

Uncaught TypeError: Cannot read properties of null (reading '0')是一种类型错误，意味着在代码中尝试读取一个空值（null）的属性。具体来说，这个错误指示代码中的某个地方尝试访问一个名为'0'的属性，但该属性的值为空值（null），因此无法读取。这种错误通常发生在使用getAttribute()方法时，该方法用于获取元素的属性值。然而，当尝试获取一个不存在的属性或者属性值为空时，就会出现这种错误。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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