A page element appendchild the problem of appending to another page element _javascript tips

You usually create your own elements and then append to the page, but what if the page itself has elements append to another page element?

looks like :

The element does become a child of another element

And the elements themselves are not.

In other words, disappeared. Rather than copying

This, indeed, is the case, but I think the mechanism is very strange.

Can not be copied, that is, 1 became the child of 2, and then 1 is still there.

This is not to say that demand is generally the case. On the contrary, the need is usually to delete the original, such as the case

But logically, think about it: first Append, then we delete the original 1 elements ourselves.

Now, append also has its own remove function.

Be aware.