em...hello,I I like the special effects you wrote，it is very interesting. But there are a few small problems，When I move from the bottom right to the left, then from left to right，After many times，It will make a mistake，On the index.js:3316 ，It is“Uncaught TypeError: Cannot read property 'getOrigin' of undefined”.One more question，On the index.js:3394,'var t = document.getElementById("tag"),' should be 'var t = document.getElementsByClassName("tag"),',I have solved the problem.But the first question, I can't find the reason.May I trouble you for a minute?
Be deeply grateful.