小编S.a*_*der的帖子

var num1 = Number(document.getElementById("n1").value);
var num2 = Number(document.getElementById("n2").value);

function sum() {
  var result = num1 + num2;
  console.log(result);
}

<input type="text" id="n1">
<input type="text" id="n2">
<button id="btn" onclick="sum();">Submit</button>
<script src="javascript.js"></script>