<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>简易计算器</title>
<script language="javascript">
//加法
function add(){
var num1=parseInt(document.getElementById("num1").value);
var num2=parseInt(document.getElementById("num2").value);
var result=document.getElementById("result");
result.value=num1+num2;
}
//减法
function sub(){
var num1=parseInt(document.getElementById("num1").value);
var num2=parseInt(document.getElementById("num2").value);
var result=document.getElementById("result");
result.value=num1-num2;
}
//乘法
function mul(){
var num1=parseInt(document.getElementById("num1").value);
var num2=parseInt(document.getElementById("num2").value);
var result=document.getElementById("result");
result.value=num1*num2;
}
//除法
function div(){
var num1=parseInt(document.getElementById("num1").value);
var num2=parseInt(document.getElementById("num2").value);
var result=document.getElementById("result");
result.value=num1/num2;
}
</script>
<style type="text/css">
body {
height: 350px;
300px;
margin-top: 50px;
margin-left: 50px;
line-height: 45px;
}
</style>
</head>
<body>
num1:<input name="num1" type="text" id="num1" /><br />
num2:<input name="num2" type="text" id="num2" /><br />
<input name="add" type="button" value="+" onclick="add()"/>
<input name="sub" type="button" value="-" onclick="sub()"/>
<input name="mul" type="button" value="*" onclick="mul()"/>
<input name="div" type="button" value="/" onclick="div()"/><br />
result:<input name="result" type="text" id="result" /><br />
</body>
</html>
In a other way：