My javascript not working

Question

I tried making a calculator my own way, so after integrating javascript every button i press on replaces the other. Like for example when i press the number 9 and I press the number 8 instead of 98, the number 8 replaces the number 9. Any help ??? link to code https://code.sololearn.com/Wao1aM4kQyFN/?ref=app

i only tried with the number 8 and 9

Answer 1

Use += in place of = for display values
https://code.sololearn.com/Wt6zg3huchnw/?ref=app
https://code.sololearn.com/W13085NdQ798/?ref=app

Answer 2

thank you very much I appreciate it