Question

<title>Calculator</title>

<script type="text/javascript">

    function Calculate(){

        var myWorker = document.getElementById('myOperation');
        var numberOne= document.getElementById('firstNumber').value;
        var numberTwo= document.getElementById('secondNumber').value;
        if (myWorker = "+") {
            var provideAnswer = (numberOne + numberTwo);
            var finalAnswer= document.getElementById('myAnswer');
            finalAnswer.innerHTML = provideAnswer;
        }

        else {

            alert('Please use Addition Symbol Only')

        }
    }
</script>

<h1>CALCULATOR</h1>

<br/>

<h2>Enter the first number</h2>
    <input type="number" id="firstNumber" />

<br/>
<br/>

<h2>Enter the Operation</h2>

    <input type="text" id="myOperation" />

<br/>
<br/>

<h2>Enter the second number</h2>
    <input type="number" id="secondNumber" />
    <input type="submit" value="Answer Is" onclick="Calculate()"/>
<br/>
<br/>

<h1 id="myAnswer">Your ANSWER Will be REPLACED by THIS TEXT</h1>

Answer 1

您需要首先将值解析为数字-最快，最简单的方法是使用一元+运算符：

function Calculate() {

        
  var myWorker = document.getElementById('myOperation');      
  var numberOne = +document.getElementById('firstNumber').value;      
  var numberTwo = +document.getElementById('secondNumber').value;      
  if (myWorker == "+") {        
    var provideAnswer = (numberOne + numberTwo);        
    var finalAnswer = document.getElementById('myAnswer');        
    finalAnswer.innerHTML = provideAnswer;      
  } else {

            
    alert('Please use Addition Symbol Only')

          
  }    
}

<h1>CALCULATOR</h1>
<h2>Enter the first number</h2>
<input type="number" id="firstNumber" />
<h2>Enter the Operation</h2>
<input type="text" id="myOperation" />
<h2>Enter the second number</h2>
<input type="number" id="secondNumber" />
<input type="submit" value="Answer Is" onclick="Calculate()" />
<h1 id="myAnswer">Your ANSWER Will be REPLACED by THIS TEXT</h1>

_{（我对HTML标记进行了一些修改，以删除换行符）}

计算器不会将两个数字相加，而只是将它们写在一起，例如“ 2 + 2 = 22”

1 个答案: