--> So this method is used in cases when you want to select the 1st elements our of many or if you want to select a particular element or a uinque element Note when we are using queryselector and we ...
在看代码的时候发现基本上都是用 querySelector() 和 querySelectorAll() 来获取元素，疑惑为什么不用 getElementById()。 可能因为自己没用过那两个，所以并不清楚原因所在。 定义： getElementsByTagName ...
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