[英]How to convert user entered date string into JavaScript date format
我想在用戶輸入出生日期時計算用戶的年齡。 我通過文本字段獲得了用戶輸入的值。 但我得到的輸出是 NaN。 我認為將字符串轉換為日期時出錯。 這是我的代碼。
function printage() { var dob = document.getElementById("dob").value; var age; var past; var now; var a; past = dob.getDate(); a = Date.parse(past); now = Date.now(); age = now - past; var millisecond = age; var second = 1000; var minute = second * 60; var hour = minute * 60; var day = hour * 24; var year = day * 365; var years = Math.round(millisecond / (day * 365)); var message = "Age in years" + years; document.getElementById("demo").innerHTML = years; }
<!DOCTYPE html> <html> <head> </head> <body> <label for="age">Enter your date of birth</label> <input type="text" id="dob" name="dob"> <button onclick="printage()" type="button">Age</button> <p id="demo"></p> </body> </html>
使用past=new Date(dob)而不是getDate()
<html> <head> </head> <body> <label for="age">Enter your date of birth</label> <input type="text" id="dob" name="dob"> <button onclick="printage()" type="button">Age</button> <p id="demo"></p> <script> function printage() { var dob = document.getElementById("dob").value; var age; var past; var now; var a; past =new Date(dob); console.log(past) a = Date.parse(past); now = Date.now(); age = now - past; var millisecond = age; var second = 1000; var minute = second * 60; var hour = minute * 60; var day = hour * 24; var year = day * 365; var years = Math.round(millisecond / (day * 365)); var message = "Age in years" + years; document.getElementById("demo").innerHTML = years; } </script> </body> </html>
javascript：如何將文本字段中輸入的日期轉換為 Javascript 中的日期格式
[英]javascript: How to convert dates entered in text fields to Date Format in Javascript
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