获取数组中符合条件的值的个数
发布时间:2020-12-17 08:36:12 所属栏目:安全 来源:网络整理
导读:countBy_.countBy(list,iteratee,[context]) Sorts a list into groups and returns a count for the number of objects in each group. Similar to groupBy,but instead of returning a list of values,returns a count for the number of values in that g
countBy_.countBy(list,iteratee,[context]) Sorts a list into groups and returns a count for the number of objects in each group. Similar to groupBy,but instead of returning a list of values,returns a count for the number of values in that group. _.countBy([1,2,3,4,5],function(num) { return num % 2 == 0 ? 'even': 'odd'; }); => {odd: 3,even: 2} 引用地址:http://underscorejs.org/#countBy 自己例子: const ck = _.countBy(this.handlingUnitMaterials,function (hu) { return hu.checked == true ? 'ischecked' : 'nochecked'; });返回的ck就是一个对象。自己打印看看即可 (编辑:李大同) 【声明】本站内容均来自网络,其相关言论仅代表作者个人观点,不代表本站立场。若无意侵犯到您的权利,请及时与联系站长删除相关内容! |