I want to implement a feature,Listen for changes in one range and assign values to another range.

My implementation steps：

1.Use the onChanged event to listen for changes to the data.

2.Assign the changed value【event.details.valueAfter】 to the target range in the callback function.

This is my code： https://i.stack.imgur.com/lealz.png

But the console will show that it ran the callback many times,This is the console log： https://i.stack.imgur.com/SS941.png

Is there something wrong with my code?Is there a good solution?