I want to click the button and count the quantity but it doesn't work. and error message: Uncaught ReferenceError: cnt is not defined This is my code:
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>Make777</title> <link rel="stylesheet" href="./style.css"> </head> <body> <button type="button" class="btn-click" onclick="dongjak_button();">CLICK</button> <span>You Clicked This Button <span id="number"></span>Times!!!!!!</span> <script src="./script.js"></script> </body> </html>
"use strict";
function dongjak_button(){
cnt = 0;
cnt++;
document.getElementById("number").value = cnt;
}
help. I want the cnt variable to be valid. and displayed on html
![[Web front-end] Node.js quick start](https://img.php.cn/upload/course/000/000/067/662b5d34ba7c0227.png)
You must use
varorletto declare JavaScript variables.Learn more here: https://www.w3schools.com/js/js_variables.asp
"use strict"; function dongjak_button(){ let cnt = 0; cnt++; document.getElementById("number").textContent = cnt; }The code still doesn't work because you need to get the count from
#numberfirst."use strict"; function dongjak_button(){ const number = document.getElementById("number"); const value = number.textContent; let cnt = value ? Number(value) : 0; cnt++; number.textContent = cnt; }You are in strict mode and have not declared a
cntvariable. See MDN Documentation.You also cannot change the
valueonspan— you needtextContent. Also, yourcntis reset every time, so you need to store the variable outside the function. all in all:// stored outside the function so it increments rather than resets let cnt = 0; function dongjak_button(){ cnt++; // use textContent, not value; also add a space document.getElementById("number").textContent = cnt + ' '; }You Clicked This Button Times!!!!!!