17 line, change return json_encode to echo json_encode
check the error report. There is something wrong with your url route. Do you want to adjust the charge_index method?
if you say you have no problem, then you can see if the return format in network is not standard json, request at all, and has not reached success. Ajax
var_dump(charge_index());to
echo charge_index(); 1. Write the success callback and error callback of ajax to facilitate debugging problems, but don't save trouble
2. Change var_dump to echo
3. json_encode the second parameter is not true/false
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