1.获取当前年月日
// 获取当前年月日
export function getNowFormatDate(interval = "/") {let date = new Date(),year = date.getFullYear(), //获取完整的年份(4位)month = date.getMonth() + 1, //获取当前月份(0-11,0代表1月)strDate = date.getDate(); // 获取当前日(1-31)if (month < 10) month = `0${month}`; // 如果月份是个位数，在前面补0if (strDate < 10) strDate = `0${strDate}`; // 如果日是个位数，在前面补0return `${year}${interval}${month}${interval}${strDate}`;
}
2.获取当前时分秒
// 获取当前时分秒
const formatV = (val) => {if (val < 10) return "0" + val;return val;
};
export function getLocalTime() {var date = new Date();// var Y = date.getFullYear() + '-'// var M = formatV(date.getMonth() + 1) + '-'// var D = formatV(date.getDate()) + ' 'var h = formatV(date.getHours()) + ":";var m = formatV(date.getMinutes()) + ":";var s = formatV(date.getSeconds());return h + m + s;
}
3.获取当前星期
// 获取当前星期
export function getWeekDay() {const WeekDays = ["星期日","星期一","星期二","星期三","星期四","星期五","星期六",];return WeekDays[new Date().getDay()];
}
4.获取本月第一天日期
// 获取本月第一天日期
export function getMonthFirst() {const currentDate = new Date();const year = currentDate.getFullYear(); //获取当前年const month = String(currentDate.getMonth() + 1).padStart(2, "0"); //获取当前月const firstDay = "01"; //日return `${year}-${month}-${firstDay}`;
}
5.获取本月最后一天日期
// 获取本月最后一天日期
export function getMonthLast() {// 获取当前日期const currentDate = new Date();// 获取当前年份let year = currentDate.getFullYear();// 获取下个月的月份，使用 padStart 在月份小于 10 时在前面补零let month = String(currentDate.getMonth() + 2).padStart(2, "0");// 如果月份为 '13'，说明当前是12月，需要更新年份并将月份设置为 '01'if (month === "13") {year = year + 1;month = "01";}// 设置每个月的第一天为 '01'let firstDay = "01";// 构建下个月的第一天的日期字符串，格式为 'YYYY-MM-DD'const firstDayOfNextMonth = `${year}-${month}-${firstDay}`;// 计算当前月的最后一天，通过减去一天的毫秒数来得到const lastDayOfMonth = new Date(new Date(firstDayOfNextMonth).getTime() - 86400000);// 将最后一天的日期转换为 ISO 格式，并提取日期部分return lastDayOfMonth.toISOString().split("T")[0];
}
6.获取本年第一天日期
// 获取本年第一天日期
export function getYearFirst() {var date = new Date();var year = date.getFullYear();return year + "-" + "01" + "-" + "01";
}
7.获取本年最后一天日期
// 获取本年最后一天日期
export function getYearLast() {// 获取当前年份const thisYear = new Date().getFullYear();// 创建下一年的第一天const nextYearFirstDay = new Date(thisYear + 1, 0, 1); // 注意：月份是从0开始的，0代表1月// 减去一天得到今年的最后一天const thisYearLastDay = new Date(nextYearFirstDay - 1);// 获取年月日const year = thisYearLastDay.getFullYear();const month = String(thisYearLastDay.getMonth() + 1).padStart(2, "0"); // 月份是从0开始的，所以需要加1const date = String(thisYearLastDay.getDate()).padStart(2, "0");// 组合成 YYYY-MM-DD 格式const formattedDate = `${year}-${month}-${date}`;return formattedDate;
}
8.时间戳转年月日
// 时间戳转年月日
export function formatDate(value) {if (typeof value == "undefined") {return "";} else {let date = new Date(parseInt(value));let y = date.getFullYear();let MM = date.getMonth() + 1;MM = MM < 10 ? "0" + MM : MM;let d = date.getDate();d = d < 10 ? "0" + d : d;// let h = date.getHours();// h = h < 10 ? "0" + h : h;// let m = date.getMinutes();// m = m < 10 ? "0" + m : m;// let s = date.getSeconds();// s = s < 10 ? "0" + s : s;return y + "-" + MM + "-" + d;}
}
9.前端导出csv文件
// 前端导出csv文件
export function exportCsv(columns, dataList, fileName) {let title = columns.map(item => item.title);let keyArray = columns.map(item => item.key);let str = [];str.push(title.join(',') + '\n');for (let i = 0; i < dataList.length; i++) {const temp = [];for (let j = 0; j < keyArray.length; j++) {temp.push(dataList[i][keyArray[j]]);}str.push(temp.join(',') + '\n');} console.log(str)let uri = 'data:text/csv;charset=utf-8,\ufeff' + encodeURIComponent(str.join(''));let downloadLink = document.createElement('a');downloadLink.href = uri;downloadLink.download = fileName;document.body.appendChild(downloadLink);downloadLink.click();document.body.removeChild(downloadLink);
}
10.前端导出xml文件
// 前端导出xml文件
export function exportXml(columns, dataList, fileName) {let str = '<?xml version="1.0" encoding="utf-8" ?>\n<dataSource>\n';dataList.forEach(dataItem => {str += `<dataItem>\n`;columns.forEach(columnsItem => {str += `<${columnsItem.key}>${dataItem[columnsItem.key]}</${columnsItem.key}>\n`;});str += `</dataItem>\n`;});str += '</dataSource>';let downloadLink = document.createElement('a');let uri = window.URL.createObjectURL(new Blob([str], { type: 'text/plain;charset=utf-8,\ufeff' }));downloadLink.href = uri;downloadLink.download = `${fileName}.xml`;downloadLink.click();window.URL.revokeObjectURL(uri);
}
11.前端导出html文件
// 前端导出html文件
export function exportHtml(columns, dataList, fileName) {let str = '<table border="1" style="border-collapse: collapse;min-width:80%;margin:0 10%;">\n';columns.forEach(columnsItem => {str += `<th>${columnsItem.title}</th>\n`;});dataList.forEach(dataItem => {str += `<tr>\n`;columns.forEach(columnsItem => {str += `<td>${dataItem[columnsItem.key]}</td>\n`;});str += `</tr>\n`;});str += '</table>';let html = `<!DOCTYPE html><html lang="en"><head><meta charset="UTF-8"><meta http-equiv="X-UA-Compatible" content="IE=edge"><meta name="viewport" content="width=device-width, initial-scale=1.0"><title>Document</title></head><body><h2 style="text-align:center">${fileName}</h2><div style="width:100%">${str}</div></body></html>`;let downloadLink = document.createElement('a');let uri = window.URL.createObjectURL(new Blob([html], { type: 'text/html;charset=utf-8,\ufeff' }));downloadLink.href = uri;downloadLink.download = `${fileName}.html`;downloadLink.click();window.URL.revokeObjectURL(uri);
}
12.前端导出pdf文件
// 前端导出pdf文件
export function exportPDF(columns, dataList, fileName) {let str = '<table border="1" style="border-collapse: collapse;min-width:80%;margin:0 10%;">\n';columns.forEach(columnsItem => {str += `<th>${columnsItem.title}</th>\n`;});dataList.forEach(dataItem => {str += `<tr>\n`;columns.forEach(columnsItem => {str += `<td>${dataItem[columnsItem.key]}</td>\n`;});str += `</tr>\n`;});str += '</table>';let ele = document.createElement('div');ele.innerHTML = `<h2 style="text-align:center">${fileName}</h2><div style="width:100%">${str}</div>`;document.body.appendChild(ele);// var w = ele.offsetwidth; //获得该容器的宽// var h = ele.offsetwidth; //获得该容器的高// var offsetTop = ele.offsetTop + 24; //获得该容器到文档顶部的距离// var offsetLeft = ele.offsetLeft + 24; //获得该容器到文档最左的距离var w = 960; //获得该容器的宽var h = 1024; //获得该容器的高var offsetTop = 24; //获得该容器到文档顶部的距离var offsetLeft = 24; //获得该容器到文档最左的距离var canvas = document.createElement('canvas');var abs = 0;var win_i = document.body.clientwidth; //获得当前可视窗口的宽度（不包含滚动条)var win_o = window.innerwidth; //获得当前窗口的宽度（包含滚动条)if (win_o > win_i) {abs = (win_o - win_i) / 2; //获得滚动条长度的—半}canvas.width = w * 2; //将回布宽&&高放大两倍canvas.height = h * 2;var context = canvas.getContext('2d');context.scale(2, 2);context.translate(-offsetLeft - abs, -offsetTop);//这里默认横向没有滚动条的情况，因为offset.Left(),有无滚动条的时候存在差值，因此 transLate的时候，要把这个差值去掉html2canvas(ele, {allowTaint: true,scale: 2, //提升画面质量，但是会增加文件大小}).then(function(canvas) {var contentwidth = canvas.width;var contentHeight = canvas.height;//一页pdf显示htmL页面生成的canvas高度;var pageHeight = (contentwidth / 592.28) * 841.89;//未生成pdf 的htmL页面高度var leftHeight = contentHeight;//页面偏移var position = 0;//a4纸的尺寸[ 595.28,841.89]，html页面生成的canvas在pdf中图片的宽高var imgwidth = 595.28;var imgHeight = (592.28 / contentwidth) * contentHeight;var pageData = canvas.toDataURL(' image/jpeg ', 1.0);var pdf = new jsPDF('', 'pt', 'a4');console.log(pdf);//有两个高度需要区分，一个是htmL页面的实际高度，和生成pdf的页面高度(841.89) 当内容未超过pdf—页显示的范围，无需分页if (leftHeight < pageHeight) {pdf.addImage(pageData, 'JPEG', 0, 0, imgwidth, imgHeight);} else {//分页while (leftHeight > 0) {pdf.addImage(pageData, 'JPEG', 0, position, imgwidth, imgHeight);leftHeight -= pageHeight;position -= 841.89;//避免添加空白页if (leftHeight > 0) {pdf.addPage();}}}pdf.save(`${fileName}.pdf`);document.body.removeChild(ele);});
}
const s2ab = s => {var buf;if (typeof ArrayBuffer !== 'undefined') {buf = new ArrayBuffer(s.length)var view = new Uint8Array(buf)for (var i = 0; i != s.length; ++i) view[i] = s.charCodeAt(i) & 0xffreturn buf} else {buf = new Array(s.length);for (var i = 0; i != s.length; ++i) buf[i] = s.charCodeAt(i) & 0xFF;return buf;}
}
13.树状结构过滤掉某个属性值
//arr 数组 ， value :过滤掉的值
export function recursivefilter(arr, value) {return arr.filter(item => {if (item.type === value) {return false}if(item.children && item.children.length > 0){item.children = recursivefilter(item.children , value)}return true})
}
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