如何在JS / jQuery中编写此php数组函数？

Question

这在PHP中效果很好，如何在JS / jQuery中完成相同的工作？

$statsArr['Status'][$s_id]['count'] = ($statsArr['Status'][$s_id]['count'] ?? 0) + 1;

Answer 1

您必须将每个数组定义为一个数组。 这样你就不会missing ; before statement missing ; before statement错误。

var s_id = 0;
var statsArr = Array();
statsArr['Status'] = Array();
statsArr['Status'][s_id] = Array();
statsArr['Status'][s_id]['count'] = statsArr['Status'][s_id]['count'] + 1 || 0;
// the result will be 0 since statsArr['Status'][s_id]['count'] was not defined previously