开发者问题收集
如何解决此“未捕获的 TypeError：无法将未定义或 null 转换为对象”[重复]
我的功能是：function collect_que_ids(e) {var val = e.val();var data_lo = e.attr('data-lo');new_hash = {};new_hash[val] = data_lo;if(e.is(':checked')){if(checked_box_hash.includes(new_hash)){checked_box_hash
javascript jquery ruby-on-rails arrays hash
2016-08-29