流程引擎-自定义函数的应用-编程知识

流程引擎-自定义函数的应用

背景：

某些业务需求比较特殊，需要在表单中校验或实现一些功能，泛微流程表单配置时实现的方式多种多样：JS脚本、SQL语句、公式以及其他一些标准化拖拽功能，本次给大家分享一下流程表单中的公式实现的一些需求场景。
泛微流程表单中的公式后台实际引用的是一些定义好的函数，比如计算函数SUM、ABS、MIN等，字符数据处理函数SUBSTR、TRIM、ToString，日期函数CurrDate、MaxDate等这些都是系统内置的系统函数，当业务诉求功能实现时这些系统函数可能无法实现，就需要自己写一些自定义函数用来支撑这部分需求实现。
1、实现自动获取当前日期1年后的日期；

/*** 获取一年后时间* @param */
function getAfterDateTime(timeStr) {let now = new Date(timeStr);let year = now.getFullYear()+1; //得到年份let month = (now.getMonth()+1).toString().padStart(2, "0"); //得到月份let day = (now.getDate()).toString().padStart(2, "0"); //得到日期//console.log(1+"___"+year+"_"+month+"_"+day);if (month == '01' && day == '00') {year = now.getFullYear(); //得到年份month = '12';day = '31'} else if ((month == '01' || month == '03' || month == '05' || month == '07' || month == '08' || month == '10' || month == '12')&& day=='31') {year = now.getFullYear() + 1; //得到年份month = (now.getMonth()+ 1).toString().padStart(2, "0"); //得到月份;day = '31' //console.log(2+"___"+year+"_"+month+"_"+day); } else if ((month == '04' || month == '06' || month == '09' || month == '11')&& day==30) {//小月year = now.getFullYear() + 1; //得到年份month = (now.getMonth()+ 1).toString().padStart(2, "0"); //得到月份;day = '30'//console.log(3+"___"+year+"_"+month+"_"+day);}else if ((year % 4 == 0 || year % 100 != 0 || year % 400 == 0)&& month=='02'&& day=='29') {//瑞年year = now.getFullYear() + 1; //得到年份month = (now.getMonth()+ 1).toString().padStart(2, "0"); //得到月份;day = '28'//console.log(4+"___"+year+"_"+month+"_"+day);} else if((year % 4 !=0)&& month=='02'&& day=='28'){//平年//console.log(5+"___"+year+"_"+month+"_"+day);year = now.getFullYear() + 1; //得到年份month = (now.getMonth()+ 1).toString().padStart(2, "0"); //得到月份;day = '28'}else {     year = now.getFullYear() + 1; //得到年份month = (now.getMonth() + 1).toString().padStart(2, "0"); //得到月份day = (now.getDate()).toString().padStart(2, "0"); //得到日期     }//console.log(6+"___"+year+"_"+month+"_"+day);return `${year}-${month}-${day}`;}

2、实现获取当前日期3个月后的日期；

/*** 获取3个月后的日期* @param */
function getThreeMonthsLaterDate(shao) {var currentDate = new Date(shao); // 获取当前日期var futureDate = new Date(currentDate.getFullYear(), currentDate.getMonth() + 3, currentDate.getDate()); // 获取三个月后的日期console.log(currentDate.getFullYear());console.log(currentDate.getMonth() + 1);console.log(currentDate.getDate());if((currentDate.getMonth() + 4 =='04' || currentDate.getMonth() + 4 =='06' || currentDate.getMonth() + 4 =='09') && currentDate.getDate()=='31'){console.log(1);return futureDate.getFullYear() + '-' + (futureDate.getMonth()) + '-' + '30';}else if(currentDate.getMonth() + 1 =='11' && currentDate.getDate()>='29'){console.log(2);return futureDate.getFullYear() + '-' + (futureDate.getMonth()) + '-' + '28';}// 返回三个月后的日期，格式为yyyy-mm-ddreturn futureDate.getFullYear() + '-' + (futureDate.getMonth() + 1) + '-' + futureDate.getDate();
}