<html lang="en">
<head>
<meta charset="UTF-8">
<title>计算机</title>
<script type="text/javascript">
window.onload = function () {
var oInput01 = document.getElementById("input01");
var oInput02 = document.getElementById("input02");
var oSelect = document.getElementById("select");
var oBtn = document.getElementById("btn");
oBtn.onclick = function () {
var val01 = oInput01.value;
var val02 = oInput02.value;
if(val01=="" || val02==""){
alert('输入框不能为空！');
return;
}
if(isNaN(val01) || isNaN(val02)){
alert('请输入数字！');
return;
}
switch (oSelect.value) {
case "0":
alert((parseFloat(val01)*100 + parseFloat(val02)*100)/100);
break;
case "1":
alert((parseFloat(val01)*100 - parseFloat(val02)*100)/100);
break;
case "2":
alert((parseFloat(val01)*100) * (parseFloat(val02)*100)/10000);
break;
case "3":
alert((parseFloat(val01)*100) / (parseFloat(val02)*100));
break;
}
}
}
</script>
</head>
<body>
<h1>计算机</h1>
<input type="text" name="" id="input01" />
<select id="select">
<option value="0">+</option>
<option value="1">-</option>
<option value="2">*</option>
<option value="3">/</option>
</select>
<input type="text" name="" value="" id="input02">
<input type="button" name="" value="计算" id="btn">
</body>
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