該主題已解決 (Solved)
Go to the 5th and maybe 6th. And study every single thing. If you don't have enough time, then go through it quickly, (skip through videos/practices if you get it.) I said 6th grade because you might be ahead.
because it does not exists. I think you want to look at : getElementsByTagName ? if not provide more information of what kind of method you search
