修改计算时间差

pages-approve/contract/detail.vue

@@ -177,6 +177,7 @@
 	import steps from '../components/steps.vue'
 	import {preViewFile} from '../utils/util.js'
 	import {uploadImg,uploadFiles} from '@/utils/uploadFile.js'
+	import {CalculationDate} from '@/utils/calculationDate.js'
 	export default{
 		components:{
 			steps
@@ -197,34 +198,7 @@
 				}
 			},
 			formateYear(s,e){
-				let flag = [1, 3, 5, 7, 8, 10, 12, 4, 6, 9, 11, 2];
-				let start = new Date(s);
-				let end = new Date(e);
-				let year = end.getFullYear() - start.getFullYear();
-				let month = end.getMonth() - start.getMonth();
-				let day = end.getDate() - start.getDate();
-				if (month < 0) {
-					year--;
-					month = end.getMonth() + (12 - start.getMonth());
-				}
-				if (day < 0) {
-					month--;
-					let index = flag.findIndex((temp) => {
-						return temp === start.getMonth() + 1
-					});
-					let monthLength;
-					if (index <= 6) {
-						monthLength = 31;
-					} else if (index > 6 && index <= 10) {
-						monthLength = 30;
-					} else {
-						monthLength = 28;
-					}
-					day = end.getDate() + (monthLength - start.getDate());
-				}
-				
-
-				return `有效期为 ${year>0?year+'年':''}${month>0?month+'个月':''}${day>0?day+'天':''}`;
+				return `有效期为 ${CalculationDate(s,e)}`;
 			}
 		},
 		computed:{

utils/calculationDate.js

@@ -0,0 +1,105 @@
+// CalculationDate 计算两个日期之间相差n年m月y天
+export const CalculationDate = (s, e) => {
+  let startDate = new Date(s);
+  let endDate = new Date(e);
+
+  let numYear = endDate.getFullYear() - startDate.getFullYear();
+
+  let numMonth = endDate.getMonth() + 1 - (startDate.getMonth() + 1);
+
+  let numDay = 0;
+  //获取截止月的总天数
+  let endDateDays = getMonthDay(endDate.getFullYear(), endDate.getMonth() + 1);
+
+  //获取截止月的前一个月
+  let endDatePrevMonthDate = getPreMonth(e);
+  //获取截止日期的上一个月的总天数
+  let endDatePrevMonthDays = getMonthDay(endDatePrevMonthDate.getFullYear(), endDatePrevMonthDate.getMonth() + 1);
+  //获取开始日期的的月份总天数
+  let startDateMonthDays = getMonthDay(startDate.getFullYear(), startDate.getMonth() + 1);
+
+  //判断，截止月是否完全被选中，如果相等，那么代表截止月份全部天数被选择
+  if (endDate.getDate() == endDateDays) {
+    numDay = startDateMonthDays - startDate.getDate() + 1;
+
+    //如果剩余天数正好与开始日期的天数是一致的，那么月份加1
+    if (numDay == startDateMonthDays) {
+      numMonth++;
+      numDay = 0;
+      //超过月份了，那么年份加1
+      if (numMonth == 12) {
+        numYear++;
+        numMonth = 0;
+      }
+    }
+  } else {
+    numDay = endDate.getDate() - startDate.getDate() + 1;
+  }
+
+  //天数小于0，那么向月份借一位
+  if (numDay < 0) {
+    //向上一个月借一个月的天数
+    numDay += endDatePrevMonthDays;
+
+    //总月份减去一个月
+    numMonth = numMonth - 1;
+  }
+
+  //月份小于0，那么向年份借一位
+  if (numMonth < 0) {
+    //向上一个年借12个月
+    numMonth += 12;
+
+    //总年份减去一年
+    numYear = numYear - 1;
+  }
+  if (numYear < 0) {
+    console.log("日期异常");
+    return;
+  }
+
+  let str = ``;
+  if (numYear > 0) {
+    str = str + numYear + "年";
+  }
+  if (numMonth > 0) {
+    str = str + numMonth + "个月";
+  }
+  if (numDay > 0) {
+    str = str + numDay + "天";
+  }
+  console.log(str);
+  return str
+};
+
+// getMonthDay 获取某年某月有多少天
+const getMonthDay = (year, month) => {
+  let days=0
+  if (month != 2) {
+    if (month == 4 || month == 6 || month == 9 || month == 11) {
+      days = 30;
+    } else {
+      days = 31;
+    }
+  } else {
+    if ((year % 4 == 0 && year % 100 != 0) || year % 400 == 0) {
+      days = 29;
+    } else {
+      days = 28;
+    }
+  }
+  return days;
+};
+
+const getPreMonth=(e)=>{
+    let time = new Date(e)
+    let year=time.getFullYear()
+    let month=time.getMonth()
+    let day=time.getDate()
+
+    if(month===0){
+        year--
+    }
+    return new Date(`${year}-${month}-${day}`)
+}
+