html5案例 - W3xue在线HTML/CSS/JS运行工具

​x
 
<!DOCTYPE HTML>
<html>
<head>
<script type="text/javascript">
function resCalc()
{
var numA=document.getElementById("num_a").value;
var numB=document.getElementById("num_b").value;
document.getElementById("result").innerHTML=Number(numA)+Number(numB);
}
</script>
</head>
<body>
<p>使用 output 元素的简易计算器：</p>
<form onsubmit="return false">
 <input id="num_a" /> +
 <input id="num_b" /> =
 <output id="result"></output>
 <input type="button" onclick="resCalc()" value="提交"></button>
 
</form>
​
</body>
</html>
​