<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/html">
<head lang="en">
<meta charset="UTF-8">
<title></title>
<script>
function add(){
var a=parseInt(document.getElementById("num1").value);/*获取a的值*/
var b=parseInt(document.getElementById("num2").value);
var c=parseInt(document.getElementById("num3").value=a+b);/*value=a+b 将a+b的值传给num3*/
// alert(a+b);
}
function de(){
var a=parseInt(document.getElementById("num1").value)/*获取a的值*/
var b=parseInt(document.getElementById("num2").value);
var c=parseInt(document.getElementById("num3").value=a-b);
// alert(a-b);
}
function mul(){ /*放在方法里，点击才开始访问数据*/
var a=parseInt(document.getElementById("num1").value);/*获取a的值*/
var b=parseInt(document.getElementById("num2").value);
var c=parseInt(document.getElementById("num3").value=a*b);
//alert(a*b);
}
function chu(){
var a=parseInt(document.getElementById("num1").value);/*获取a的值*/
var b=parseInt(document.getElementById("num2").value);
var c=parseInt(document.getElementById("num3").value=a/b);
// alert(a/b);
}
</script>
</head>
<br>
<label>简易计算器</label></br>
<label>第一个数：</label><input type="=text" id="num1"></br>
<label>第二个数：</label><input type="=text" id="num2"></br>
<button onclick="add()">+</button>
<button onclick="de()">-</button>
<button onclick="mul()">*</button>
<button onclick="chu()">/</button><br>
<label>结果：</label><input type="text" id="num3">
</body>
</html>
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/html">
<head lang="en">
<meta charset="UTF-8">
<title></title>
<script>
function add(){
var a=parseInt(document.getElementById("num1").value);/*获取a的值*/
var b=parseInt(document.getElementById("num2").value);
var c=parseInt(document.getElementById("num3").value=a+b);/*value=a+b 将a+b的值传给num3*/
alert(a+b);
}
function de(){
var a=parseInt(document.getElementById("num1").value)/*获取a的值*/
var b=parseInt(document.getElementById("num2").value);
var c=parseInt(document.getElementById("num3").value=a-b);
alert(a-b);
}
function mul(){ /*放在方法里，点击才开始访问数据*/
var a=parseInt(document.getElementById("num1").value);/*获取a的值*/
var b=parseInt(document.getElementById("num2").value);
var c=parseInt(document.getElementById("num3").value=a*b);
alert(a*b);
}
function chu(){
var a=parseInt(document.getElementById("num1").value);/*获取a的值*/
var b=parseInt(document.getElementById("num2").value);
var c=parseInt(document.getElementById("num3").value=a/b);
alert(a/b);
}
</script>
</head>
<br>
<label>简易计算器</label></br>
<label>第一个数：</label><input type="=text" id="num1"></br>
<label>第二个数：</label><input type="=text" id="num2"></br>
<button onclick="add()">+</button>
<button onclick="de()">-</button>
<button onclick="mul()">*</button>
<button onclick="chu()">/</button><br>
<label>结果：</label><input type="text" id="num3">
</body>
</html>