Question

如何在按键上将两个输入相乘并将第三个输入相加我有一个三输入字段，需要多个前两个输入和第三个输入的加法，然后显示结果字段 HTML代码：

<input type="text" tabindex="3" class="form-control" name="making_charge" oninput="calculate()" placeholder="Making Charge" id="box3" required />

 <input type="text" tabindex="3" class="form-control" name="total_price" placeholder="Total Price" id="result" readonly  />

function calculate() {
        var myBox1 = document.getElementById('box1').value; 
        var myBox2 = document.getElementById('box2').value;
        var myBox3 = document.getElementById('box3').value;
        var result = document.getElementById('result'); 
        var myResult = myBox1 * myBox2 + myBox3;
        result.value = myResult; 
    }

Answer 1

井function UpperWithCycle(str) { wordArray = str.split(" "); for (let i = 0; i < wordArray.length; i++) { wordArray[i] = wordArray[i].substring(0,1).toUpperCase() + wordArray[i].substring(1).toLowerCase(); } return wordArray.join(" "); } console.log(UpperWithCycle('hello everyone my name is Andrew, how are you doing?'));是一个字符串，因此您需要将其隐藏为数字以对其进行数学运算。

您可以使用value，+，Number()，parseInt()

parseFloat()

function calculate() {
  var myBox1 = +document.getElementById('box1').value;
  var myBox2 = +document.getElementById('box2').value;
  var myBox3 = +document.getElementById('box3').value;
  var result = document.getElementById('result');
  var myResult = myBox1 * myBox2 + myBox3;
  result.value = myResult;
}

如何在按键上将两个输入相乘并加第三个输入

1 个答案: