连接每个元素中的日期
[英]Concatenate the date in each element
问题描述
I want to concatenate the dates. 
我想连接日期。 This is my codes, I created first the year today and next date that I add 1 month to become 2019. I don't know what the problem is why it didn't display the result. 这是我的代码，我今天首先创建了第一年，第二天又添加了一个月，直到2019年。我不知道是什么问题，为什么它没有显示结果。
function myFunction() { var d = new Date(); var n = d.getFullYear(); var date = document.getElementById("demo").innerHTML = n; var d1 = new Date(); var n1 = d1.getFullYear()+1; var date1 = document.getElementById("demo1").innerHTML = n1; var str3 = "-"; var res = date.concat(str3,date1); document.getElementById("disp").innerHTML = res; }
<!DOCTYPE html> <html> <body onload="myFunction()"> <p>Click the button to display the full year of todays date.</p> <p id="demo"></p> <p id="demo1"></p> <p id="disp"></p> </body> </html>
3 个解决方案
解决方案1
0 2018-02-16 09:04:50
date is a number. date是一个数字。 Number does not have concat function. Number不具有concat功能。 Convert it into a string. 将其转换为字符串。
function myFunction() { var d = new Date(); var n = d.getFullYear(); var date = document.getElementById("demo").innerHTML = n+""; // convert to string var d1 = new Date(); var n1 = d1.getFullYear()+1; var date1 = document.getElementById("demo1").innerHTML = n1+""; var str3 = "-"; var res = date.concat(str3,date1); document.getElementById("disp").innerHTML = res; }
<!DOCTYPE html> <html> <body onload="myFunction()"> <p>Click the button to display the full year of todays date.</p> <p id="demo"></p> <p id="demo1"></p> <p id="disp"></p> </body> </html>
解决方案2
0 已采纳 2018-02-16 09:04:51
I don't know what the problem is why it didn't display the result.
Because you are getting 因为你越来越
"Uncaught TypeError: date.concat is not a function",
date is a number , it doesn't have concat method. date是一个数字 ，没有concat方法。 Convert it to String first. 首先将其转换为String 。
var res = String(date).concat(str3,date1);
Demo 演示版
function myFunction() { var d = new Date(); var n = d.getFullYear(); var date = document.getElementById("demo").innerHTML = n; var d1 = new Date(); var n1 = d1.getFullYear()+1; var date1 = document.getElementById("demo1").innerHTML = n1; console.log(date, date1); var str3 = "-"; var res = String(date).concat(str3,date1); document.getElementById("disp").innerHTML = res; }
<!DOCTYPE html> <html> <body onload="myFunction()"> <p>Click the button to display the full year of todays date.</p> <p id="demo"></p> <p id="demo1"></p> <p id="disp"></p> </body> </html>
解决方案3
0 2018-02-16 09:07:33
String.prototype.concat() String.prototype.concat（）
It is strongly recommended to use the string concatenation operators (+, +=) instead of this method for perfomance reasons
var res = date + str3 + date1;
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