utils

个人常用封装的一些工具

//文件下载
export function downloadFile(url, fileName) {
    var a = document.createElement("a");
    a.href = url;
    a.download = fileName;
    a.click();
}
// 日期格式化
/**
 * 解析时间
 * @param {Date|string|number} time - 要解析的时间。可以是Date对象、字符串或时间戳（毫秒）
 * @param {string} [pattern='{y}-{m}-{d} {h}:{i}:{s}'] - 格式化字符串
 * @return {string|null} - 格式化后的时间字符串，如果参数无效则返回null
 */
export function parseTime(time, pattern) {
    if (arguments.length === 0 || !time) {
        return null
    }
    const format = pattern || '{y}-{m}-{d} {h}:{i}:{s}'
    let date
    if (typeof time === 'object') {
        date = time
    } else {
        if ((typeof time === 'string') && (/^[0-9]+$/.test(time))) {
            time = parseInt(time)
        } else if (typeof time === 'string') {
            time = time.replace(new RegExp(/-/gm), '/').replace('T', ' ').replace(new RegExp(/\.[\d]{3}/gm), '');
        }
        if ((typeof time === 'number') && (time.toString().length === 10)) {
            time = time * 1000
        }
        date = new Date(time)
    }
    const formatObj = {
        y: date.getFullYear(),
        m: date.getMonth() + 1,
        d: date.getDate(),
        h: date.getHours(),
        i: date.getMinutes(),
        s: date.getSeconds(),
        a: date.getDay()
    }
    const time_str = format.replace(/{(y|m|d|h|i|s|a)+}/g, (result, key) => {
        let value = formatObj[key]
        // Note: getDay() returns 0 on Sunday
        if (key === 'a') { return ['日', '一', '二', '三', '四', '五', '六'][value] }
        if (result.length > 0 && value < 10) {
            value = '0' + value
        }
        return value || 0
    })
    return time_str
}
// 重置表单
export function resetForm(refName) {
    if (this.$refs[refName]) {
        this.$refs[refName].resetFields();
    }
}
// 转换字符串，undefined,null等转化为""
export function parseStrEmpty(str) {
    if (!str || str == "undefined" || str == "null") {
        return "";
    }
    return str;
}
/**
 * 构造树型结构数据
 * @param {*} data 数据源
 * @param {*} id id字段 默认 'id'
 * @param {*} parentId 父节点字段 默认 'parentId'
 * @param {*} children 孩子节点字段 默认 'children'
 */
export function handleTree(data, id, parentId, children) {
    let config = {
        id: id || 'id',
        parentId: parentId || 'parentId',
        childrenList: children || 'children'
    };

    var childrenListMap = {};
    var nodeIds = {};
    var tree = [];

    for (let d of data) {
        let parentId = d[config.parentId];
        if (childrenListMap[parentId] == null) {
            childrenListMap[parentId] = [];
        }
        nodeIds[d[config.id]] = d;
        childrenListMap[parentId].push(d);
    }

    for (let d of data) {
        let parentId = d[config.parentId];
        if (nodeIds[parentId] == null) {
            tree.push(d);
        }
    }

    for (let t of tree) {
        adaptToChildrenList(t);
    }

    function adaptToChildrenList(o) {
        if (childrenListMap[o[config.id]] !== null) {
            o[config.childrenList] = childrenListMap[o[config.id]];
        }
        if (o[config.childrenList]) {
            for (let c of o[config.childrenList]) {
                adaptToChildrenList(c);
            }
        }
    }
    return tree;
}