js逻辑中部分公共方法分享

module.exports = {
    //生成从minNum到maxNum的随机数
    randomNum(minNum, maxNum) {
        switch (arguments.length) {
            case 1:
                return parseInt(Math.random() * minNum + 1, 10);
                break;
            case 2:
                return parseInt(Math.random() * (maxNum - minNum + 1) + minNum, 10);
                break;
            default:
                return 0;
                break;
        }
    },
    //获取当前日期的字符串，如20200312
    getTodayString() {
        var time = new Date();
        var year = time.getFullYear();
        var month = this.prefixZero(time.getMonth() + 1, 2);
        var day = this.prefixZero(time.getUTCDate(), 2);
        return year + month + day;
    },
    // 时间戳转换成字符串
    formatTime(time, type = "y-m-d h:i:s") {
        type = type.toLowerCase();
        var time = new Date(time)
        var y = time.getFullYear()
        var m = time.getMonth() + 1;
        var d = time.getDate()
        var h = time.getHours()
        var i = time.getMinutes()
        var s = time.getSeconds()
        var res = ''
        for (var z = 0; z < type.length; z++) {
            if ('ymdhis'.search(type[z]) < 0) {
                res += type[z]
            } else {
                var x = eval(type[z]) < 10 ? '0' + eval(type[z]) : eval(type[z])
                res += x
            }
        }
        return res;
    },
    // 数字自动补零
    prefixZero(num, n) {
        return (Array(n).join(0) + num).slice(-n);
    },
    // 设置数字格式
    setNumFormat(num) {
        // K、M、G、T
        if (num / 1000000000000 >= 1) {
            return (num / 1000000000000).toFixed(1) + 'T';
        } else if (num / 1000000000 >= 1) {
            return (num / 1000000000).toFixed(1) + 'G';
        } else if (num / 1000000 >= 1) {
            return (num / 1000000).toFixed(1) + 'M';
        } else if (num / 1000 >= 1) {
            return (num / 1000).toFixed(1) + 'K';
        } else {
            return num;
        }
    },
    //复制内容到剪贴板
    copyContent(type, content, show) {
        if ("undefined" !== typeof dogandroid) {
            dogandroid.copyContent(type, content, show);
        } else {
            try {
                var textArea = document.getElementById("clipBoard");
                if (textArea === null) {
                    textArea = document.createElement("textarea");
                    textArea.id = "clipBoard";
                    textArea.textContent = content;
                    document.body.appendChild(textArea);
                }
                textArea.select();
                const msg = document.execCommand('copy') ? 'successful' : 'unsuccessful';
                document.body.removeChild(textArea);
                alert(show);
            } catch (err) {}
        }
    },
    // 邮箱格式校验
    chkEmail(strEmail) {
        if (!/^\w+([-+.]\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*$/.test(strEmail)) {
            return false;
        } else {
            return true;
        }
    },
    // 数字格式加逗号分隔
    numFormat(num) {
        var c = (num.toString().indexOf('.') !== -1) ? num.toLocaleString() : num.toString().replace(/(\d)(?=(?:\d{3})+$)/g, '$1,');
        return c;
    },
 // 获取地址栏url参数
    getQueryString(name) {
        var reg = new RegExp("(^|&)" + name + "=([^&]*)(&|$)", "i");
        var search = decodeURIComponent(window.location.search);
        var r = search.substr(1).match(reg);
        if (r != null) return unescape(r[2]);
        return null;
    },

}