我创建了一个简单的程序,使得两个数字的总和但是......程序是连接的,这太令人困惑了!有人可以帮忙吗？
function calculate() {
var numberOne = document.querySelector(".first").value;
var numberTwo = document.querySelector(".second").value;
var sum = numberOne + numberTwo;
document.querySelector(".result").innerHTML = "The sum of the two numbers is : " + sum;
}<!doctype html>
<html>
<body>
<p>Calculate sum of two numbers !</p>
Enter 1rst Number:<br>
<input type="number" class="first" placeholder=""><br><br> Enter 2nd Number:<br>
<input type="number" class="second" placeholder=""><br><br>
<input type="button" onclick="calculate()" value="calculate">
<p class="result"></p>
</body>
</html>Sur*_*tta 11
value为您提供String,因此String连接.考虑将其解析为整数
var sum = parseInt(numberOne) + parseInt(numberTwo);
http://jsfiddle.net/yb8r1wnw/2/