Tool = {
    /**
     * 空校验 null或""都返回true
     */
    isEmpty: (obj) => {
        if ((typeof obj === 'string')) {
            return !obj || obj.replace(/\s+/g, "") === ""
        } else {
            return (!obj || JSON.stringify(obj) === "{}" || obj.length === 0);
        }
    },

    /**
     * 非空校验
     */
    isNotEmpty: (obj) => {
        return !Tool.isEmpty(obj);
    },

    /**
     * 对象复制
     * @param obj
     */
    copy: (obj) => {
        if (Tool.isNotEmpty(obj)) {
            return JSON.parse(JSON.stringify(obj));
        }
    },

    /**
     * 使用递归将数组转为树形结构
     * 父ID属性为parent
     */
    array2Tree: (array, parentId) => {
        if (Tool.isEmpty(array)) {
            return [];
        }

        const result = [];
        for (let i = 0; i < array.length; i++) {
            const c = array[i];
            // console.log(Number(c.parent), Number(parentId));
            if (Number(c.parent) === Number(parentId)) {
                result.push(c);

                // 递归查看当前节点对应的子节点
                const children = Tool.array2Tree(array, c.id);
                if (Tool.isNotEmpty(children)) {
                    c.children = children;
                }
            }
        }
        return result;
    },

    /**
     * 随机生成[len]长度的[radix]进制数
     * @param len
     * @param radix 默认62
     * @returns {string}
     */
    uuid: (len, radix = 62) => {
        const chars = '0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz'.split('');
        const uuid = [];
        radix = radix || chars.length;

        for (let i = 0; i < len; i++) {
            uuid[i] = chars[0 | Math.random() * radix];
        }

        return uuid.join('');
    }
};