utils.js使用案例详解

//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 = &#39;&#39;;            for(let i = 0; i < num; i++) {                if (i > 0) s += &#39;,&#39;;
                s += arr[i];
            }            return s + &#39;等&#39; + arr.length + &#39;个&#39; + name;
        } else return arr.join(&#39;,&#39;);
    }