js 根据出生日期年月日 计算年龄
作者：互联网
1 <!DOCTYPE html>
2 <html>
3
4 <head>
5 <meta charset="utf-8">
6 <title></title>
7 </head>
8
9 <body>
10 <h1></h1>
11 </body>
12
13 </html>
14 <script language=javascript>
15 function getAge(strAge) {
16 const birArr = strAge.split("-");
17 const birYear = Number(birArr[0]);
18 const birMonth = Number(birArr[1]);
19 const birDay = Number(birArr[2]);
20
21 const today = new Date();
22 const nowYear = today.getFullYear();
23 const nowMonth = today.getMonth() + 1; //记得加1
24 const nowDay = today.getDate();
25 let returnAge;
26
27 if (birArr === null) {
28 return false
29 };
30 const d = new Date(birYear, birMonth - 1, birDay);
31 console.log(d.getFullYear(), birYear, (d.getMonth() + 1), birMonth, d.getDate(), birDay);
32 if (d.getFullYear() === birYear && (d.getMonth() + 1) === birMonth && d.getDate() === birDay) {
33 if (nowYear === birYear) {
34 returnAge = 0; //
35 } else {
36 let ageDiff = nowYear - birYear; //
37 if (ageDiff > 0) {
38 if (nowMonth === birMonth) {
39 let dayDiff = nowDay - birDay; //
40 if (dayDiff < 0) {
41 returnAge = ageDiff - 1;
42 } else {
43 returnAge = ageDiff;
44 }
45 } else {
46 let monthDiff = nowMonth - birMonth; //
47 if (monthDiff < 0) {
48 returnAge = ageDiff - 1;
49 } else {
50 returnAge = ageDiff;
51 }
52 }
53 } else {
54 return "出生日期晚于今天，数据有误"; //返回-1 表示出生日期输入错误 晚于今天
55 }
56 }
57 return returnAge;
58 } else {
59 return ("输入的日期格式错误！");
60 }
61 }
62 const age = getAge("2021-07-05")
63 console.log(age);
64 document.getElementsByTagName('h1')[0].innerHTML = age
65 </script>
参考
https://blog.csdn.net/u013746071/article/details/90903997
标签：ageDiff,const,birMonth,js,else,出生日期,年月日,birYear,returnAge 来源： https://www.cnblogs.com/-roc/p/14980156.html