348 lines
9.4 KiB
JavaScript
348 lines
9.4 KiB
JavaScript
import QRCode from 'qrcode';
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/**
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* 通用js方法封装处理
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* Copyright (c) 2019 klp
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*/
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// 日期格式化
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export function parseTime(time, pattern) {
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if (arguments.length === 0 || !time) {
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return null
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}
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const format = pattern || '{y}-{m}-{d} {h}:{i}:{s}'
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let date
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if (typeof time === 'object') {
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date = time
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} else {
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if ((typeof time === 'string') && (/^[0-9]+$/.test(time))) {
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time = parseInt(time)
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} else if (typeof time === 'string') {
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time = time.replace(new RegExp(/-/gm), '/').replace('T', ' ').replace(new RegExp(/\.[\d]{3}/gm), '');
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}
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if ((typeof time === 'number') && (time.toString().length === 10)) {
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time = time * 1000
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}
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date = new Date(time)
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}
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const formatObj = {
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y: date.getFullYear(),
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m: date.getMonth() + 1,
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d: date.getDate(),
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h: date.getHours(),
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i: date.getMinutes(),
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s: date.getSeconds(),
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a: date.getDay()
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}
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const time_str = format.replace(/{(y|m|d|h|i|s|a)+}/g, (result, key) => {
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let value = formatObj[key]
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// Note: getDay() returns 0 on Sunday
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if (key === 'a') { return ['日', '一', '二', '三', '四', '五', '六'][value] }
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if (result.length > 0 && value < 10) {
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value = '0' + value
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}
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return value || 0
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})
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return time_str
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}
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// 表单重置
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export function resetForm(refName) {
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if (this.$refs[refName]) {
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this.$refs[refName].resetFields();
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}
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}
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// 添加日期范围
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export function addDateRange(params, dateRange, propName) {
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let search = params;
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search.params = typeof (search.params) === 'object' && search.params !== null && !Array.isArray(search.params) ? search.params : {};
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dateRange = Array.isArray(dateRange) ? dateRange : [];
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if (typeof (propName) === 'undefined') {
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search.params['beginTime'] = dateRange[0];
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search.params['endTime'] = dateRange[1];
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} else {
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search.params['begin' + propName] = dateRange[0];
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search.params['end' + propName] = dateRange[1];
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}
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return search;
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}
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// 回显数据字典
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export function selectDictLabel(datas, value) {
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if (value === undefined) {
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return "";
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}
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var actions = [];
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Object.keys(datas).some((key) => {
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if (datas[key].value == ('' + value)) {
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actions.push(datas[key].label);
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return true;
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}
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})
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if (actions.length === 0) {
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actions.push(value);
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}
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return actions.join('');
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}
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// 回显数据字典（字符串、数组）
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export function selectDictLabels(datas, value, separator) {
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if (value === undefined || value.length ===0) {
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return "";
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}
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if (Array.isArray(value)) {
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value = value.join(",");
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}
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var actions = [];
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var currentSeparator = undefined === separator ? "," : separator;
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var temp = value.split(currentSeparator);
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Object.keys(value.split(currentSeparator)).some((val) => {
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var match = false;
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Object.keys(datas).some((key) => {
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if (datas[key].value == ('' + temp[val])) {
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actions.push(datas[key].label + currentSeparator);
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match = true;
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}
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})
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if (!match) {
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actions.push(temp[val] + currentSeparator);
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}
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})
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return actions.join('').substring(0, actions.join('').length - 1);
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}
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// 字符串格式化(%s )
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export function sprintf(str) {
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var args = arguments, flag = true, i = 1;
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str = str.replace(/%s/g, function () {
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var arg = args[i++];
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if (typeof arg === 'undefined') {
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flag = false;
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return '';
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}
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return arg;
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});
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return flag ? str : '';
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}
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// 转换字符串，undefined,null等转化为""
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export function parseStrEmpty(str) {
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if (!str || str == "undefined" || str == "null") {
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return "";
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}
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return str;
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}
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// 数据合并
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export function mergeRecursive(source, target) {
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for (var p in target) {
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try {
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if (target[p].constructor == Object) {
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source[p] = mergeRecursive(source[p], target[p]);
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} else {
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source[p] = target[p];
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}
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} catch (e) {
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source[p] = target[p];
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}
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}
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return source;
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};
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/**
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* 构造树型结构数据
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* @param {*} data 数据源
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* @param {*} id id字段 默认 'id'
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* @param {*} parentId 父节点字段 默认 'parentId'
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* @param {*} children 孩子节点字段 默认 'children'
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*/
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export function handleTree(data, id, parentId, children) {
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let config = {
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id: id || 'id',
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parentId: parentId || 'parentId',
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childrenList: children || 'children'
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};
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var childrenListMap = {};
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var nodeIds = {};
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var tree = [];
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for (let d of data) {
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let parentId = d[config.parentId];
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if (childrenListMap[parentId] == null) {
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childrenListMap[parentId] = [];
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}
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nodeIds[d[config.id]] = d;
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childrenListMap[parentId].push(d);
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}
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for (let d of data) {
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let parentId = d[config.parentId];
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if (nodeIds[parentId] == null) {
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tree.push(d);
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}
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}
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for (let t of tree) {
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adaptToChildrenList(t);
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}
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function adaptToChildrenList(o) {
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if (childrenListMap[o[config.id]] !== null) {
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o[config.childrenList] = childrenListMap[o[config.id]];
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}
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if (o[config.childrenList]) {
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for (let c of o[config.childrenList]) {
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adaptToChildrenList(c);
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}
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}
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}
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return tree;
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}
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/**
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* 参数处理
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* @param {*} params 参数
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*/
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export function tansParams(params) {
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let result = ''
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for (const propName of Object.keys(params)) {
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const value = params[propName];
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var part = encodeURIComponent(propName) + "=";
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if (value !== null && value !== "" && typeof (value) !== "undefined") {
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if (typeof value === 'object') {
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for (const key of Object.keys(value)) {
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if (value[key] !== null && value[key] !== "" && typeof (value[key]) !== 'undefined') {
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let params = propName + '[' + key + ']';
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var subPart = encodeURIComponent(params) + "=";
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result += subPart + encodeURIComponent(value[key]) + "&";
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}
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}
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} else {
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result += part + encodeURIComponent(value) + "&";
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}
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}
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}
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return result
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}
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// 验证是否为blob格式
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export function blobValidate(data) {
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return data.type !== 'application/json'
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}
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/**
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* 保存二维码为图片
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* @param {string} code 二维码内容
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* @param {string} text 下方文字
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* @param {number} index 索引，用于生成文件名
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* @param {Object} context Vue组件实例上下文（需要包含$message、barcodeWidth、barcodeHeight）
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*/
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export async function saveAsImage(code, text, index, context) {
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// 确保上下文存在
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if (!context) {
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console.error('缺少组件上下文，请传入Vue实例');
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return;
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}
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try {
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// 检查QRCode库是否加载
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if (typeof QRCode === 'undefined') {
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throw new Error('QRCode库未加载，请确保已引入');
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}
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// 创建临时canvas用于绘制二维码和文字
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const canvas = document.createElement('canvas');
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const ctx = canvas.getContext('2d');
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if (!ctx) {
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throw new Error('无法获取canvas上下文');
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}
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// 从上下文获取尺寸参数，提供默认值
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const barcodeWidth = context.barcodeWidth || 200;
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const barcodeHeight = context.barcodeHeight || 200;
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const textHeight = 30; // 文字区域高度
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canvas.width = barcodeWidth;
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canvas.height = barcodeHeight + textHeight;
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// 绘制二维码
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const qrCanvas = document.createElement('canvas');
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qrCanvas.width = barcodeWidth;
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qrCanvas.height = barcodeHeight;
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// 等待二维码绘制完成
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await new Promise((resolve, reject) => {
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QRCode.toCanvas(qrCanvas, code, {
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width: barcodeWidth,
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height: barcodeHeight,
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margin: 0,
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errorCorrectionLevel: 'M'
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}, (error) => {
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if (error) reject(error);
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else resolve();
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});
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});
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// 将二维码绘制到主canvas
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ctx.drawImage(qrCanvas, 0, 0);
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// 绘制文字（处理文字过长情况）
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ctx.fillStyle = '#000';
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ctx.font = '14px Arial, sans-serif';
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ctx.textAlign = 'center';
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ctx.textBaseline = 'top';
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// 处理过长文字，最多显示2行
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const maxTextWidth = barcodeWidth - 20; // 预留边距
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let displayText = text;
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if (ctx.measureText(text).width > maxTextWidth) {
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// 尝试截断并添加省略号
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let i = text.length;
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while (ctx.measureText(text.substring(0, i)).width > maxTextWidth && i > 0) {
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i--;
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}
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displayText = text.substring(0, i) + '...';
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}
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ctx.fillText(displayText, barcodeWidth / 2, barcodeHeight + 5);
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// 创建图片链接并下载
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canvas.toBlob(blob => {
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if (!blob) {
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throw new Error('无法生成图片blob对象');
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}
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try {
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const url = URL.createObjectURL(blob);
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const a = document.createElement('a');
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// 处理文件名特殊字符
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a.download = `二维码_${index + 1}.png`;
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a.href = url;
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// 模拟点击下载
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document.body.appendChild(a);
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const event = new MouseEvent('click');
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a.dispatchEvent(event);
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// 清理资源
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setTimeout(() => {
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document.body.removeChild(a);
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URL.revokeObjectURL(url);
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}, 100);
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context.$message.success('图片保存成功');
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} catch (urlError) {
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console.error('创建下载链接失败:', urlError);
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context.$message.error('创建下载链接失败');
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}
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}, 'image/png'); // 明确指定MIME类型
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} catch (error) {
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console.error('保存图片失败:', error);
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context.$message.error(`保存图片失败: ${error.message || '未知错误'}`);
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}
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}
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