We now maintain an index variable. Previously, the cursor was always at the right-end of the input, since you couldn't use arrow keys to move it left, and new input was always appended at the right-end. Now, we need to keep a separate index which is not necessarily at the end of the input, and when a user enters a character we splice it into the input in the correct location.
https://feedx.net，推荐阅读新收录的资料获取更多信息
。新收录的资料是该领域的重要参考
Мир Российская Премьер-лига|20-й тур
Credit: The Pokémon Company。关于这个话题，新收录的资料提供了深入分析
but still felt sketch making a non-reversible transfer of