PHP returns a two-dimensional array to ajax. How does ajax display the values ​​in this two-dimensional array on the page?

Question

As the title states, PHP has successfully passed the two-dimensional array back to ajax. Using alert in ajax can successfully print out the two-dimensional array, but when alerting a one-dimensional array, a pop-up window will appear

#Prompt is undefined. I want to display the specific values ​​in the two-dimensional array on the page. Could you please tell me how to achieve this?

Answer 1

alert cannot print out the array, use console.log to test it