Detailed explanation of utils.js use cases

//记录集中查找位置 findIndex: function (id, feild, arr) { let index = -1, tem = []; if (id && feild && arr && arr.length) { arr.forEach((t, i) => { tem.push(t[feild]); }); index = tem.indexOf(id); } return index; }, //日期格式化 formatDate (date, fmt) { var o = { "M+": date.getMonth() + 1, //月份 "d+": date.getDate(), //日 "h+": date.getHours(), //小时 "m+": date.getMinutes(), //分 "s+": date.getSeconds(), //秒 "q+": Math.floor((date.getMonth() + 3) / 3), //季度 "S": date.getMilliseconds() //毫秒 }; if (/(y+)/.test(fmt)) { fmt = fmt.replace(RegExp.$1, (date.getFullYear() + "").substr(4 - RegExp.$1.length)); } for (var k in o) { if (new RegExp("(" + k + ")").test(fmt)) { fmt = fmt.replace(RegExp.$1, (RegExp.$1.length == 1) ? (o[k]) : (("00" + o[k]).substr(("" + o[k]).length))); } } return fmt; }, //千分位处理 thousands: function (num) { if (typeof num !== 'number') return 0; return (num.toFixed(2) + '').replace(/\d{1,3}(?=(\d{3})+(\.\d*)?$)/g, '$&,'); }, // 首字母大写 capitalize: function (str) { return str.substring(0,1).toUpperCase() + str.substring(1); }, // 处理简写数组 calcArray: function (list, num, field, name) { let arr = []; if (list.length) { arr = list.map(item => { return item[field]; }); } if (arr.length > num) { let s = ''; for(let i = 0; i < num; i++) { if (i > 0) s += ','; s += arr[i]; } return s + '等' + arr.length + '个' + name; } else return arr.join(','); }