如何修复我不断收到的 Javascipt 中的 NaN 错误？

Question

I've a practical assignment for middle school, to make a simple Javascript website. But I keep getting a NaN on my website. I can't figure out why. Mayby some-one understands what I do wrong. Thanks by forehand.

 var timer = setInterval(time, 5000); function time() { document.getElementById('change').innerHTML = Date(); } var calculate = setInterval(calcFunction, 5000); function calcFunction(inputValue, change) { var answer = Number(inputValue) + 1; document.getElementById('answer').innerHTML = answer; }

 <input type="text" id="inputValue"> <p id="answer"></p>

Answer 1

You need the value of the inputValue inside the calcFunction

 var timer = setInterval(time, 5000); function time() { document.getElementById('change').innerHTML = new Date().toLocaleDateString(); } var calculate = setInterval(calcFunction, 5000); function calcFunction() { var answer = Number(document.getElementById("inputValue").value) + 1; document.getElementById('answer').innerHTML = answer; } time() calcFunction()

 <span id="change"></span><br/> <input type="text" id="inputValue"> <p id="answer"></p>