javaScript将两个数字相乘并将结果显示到第三个html输入中

Question

I am trying to take a number from my html form and then multiply it with a number from my JavaScript function and displaying the result in another html input. Want I want is when the user click on the result input area then only the multiplication result shows.

<script type="text/javascript">
  function myFunction() {
    var y = document.getElementById("km").value;
    var z = 14;
    var x = y * z;
    document.getElementById("bill").innerHTML = x;


  }
<table>
<tr> 
   <td>Total Kms Run</td>
   <td><input type="text" id="km" name="km" required>
   </tr>
    <tr> 
   <td>Total Bill</td>
   <td><input type="text" id = "bill" name="bill" required onclick="myFunction()">
   </tr>
</table

Answer 1

You're adding the numbers, not multiplying them :).

That aside, input s don't have innerHTML , you need to set the value :

document.getElementById("bill").value = x;

Answer 2

Do Change like this

<script type="text/javascript">
  function myFunction() {

   var y = document.getElementById("km").value;
    var z = 14;
    var x = y * z;
    document.getElementById("bill").value = x;


  }</script>

Answer 3

You have made many syntax mistakes in html

 function myFunction() { var y = document.getElementById("km").value; var z = 14; var x = Number(y) * Number(z); document.getElementById("bill").value = x; } 

 <table> <tr> <td>Total Kms Run</td> <td><input type="text" id="km" name="km" required ></td> </tr> <tr> <td>Total Bill</td> <td><input type="text" id="bill" name="bill" required onclick="myFunction()"></td> </tr> </table>