<html lang="en">
<head>
<meta charset="UTF-8">
<title>computer</title>
<script>
function compute(){
str1=Number(document.getElementById("txt1").value)
str2=Number(document.getElementById("txt2").value)
comp=document.getElementById("select").value
var result
switch(comp) {
case "+":
comp=str1+str2
case "-":
comp=str1-str2
break
case "*":
comp=str1*str2
break
case "/":
if(str2==0){
comp=''
}else{
comp=str1/str2
}
break
}
document.getElementById("result").value=comp
}
</script>
</head>
<body>
<input type="text" id="txt1"/>
<select name="method" id="select">
<option value="+">+</option>
<option value="-">-</option>
<option value="*">*</option>
<option value="/">/</option>
</select>
<input type="text" id="txt2"/>
<input type="button" id="b1" value="等于" onclick="compute()" />
<input type="text" id="result"/>
</body>
</html>
<!DOCTYPE html><html>
<head>
<meta http-equiv="Content-Type" content="text/htmlcharset=utf-8" />
<title></title>
</head>
<body>
<table>
<tr>
<td><input type="button" value="add" onclick="setOp('+', 'add')"/></td>
<td><input type="button" value="miner" onclick="setOp('-', 'miner')"/></td>
<td><input type="button" value="times" onclick="setOp('*', 'times')"/></td>
<td><input type="button" value="divide" onclick="setOp('/', 'divide')"/></td>
</tr>
</table>
<table id="tb_calc" style="display:none">
<tr>
<td><input id="x" type="text" style="width:100px" value="" name="x" /></td>
<td><lable id="op" name="op"></lable></td>
<td><input id="y" type="text" style="width:100px" value="" name="y" /></td>
<td><input id="opTips" type="button" value="" onclick="calc()"/></td>
<td><lable id="z" name="z"></lable></td>
</tr>
</table>
<script type="application/javascript">
function setOp(op, opTips)
{
var tb=document.getElementById("tb_calc")
tb.style.display = "none"
document.getElementById("x").value = ""
document.getElementById("y").value = ""
document.getElementById("z").innerText = ""
document.getElementById("op").innerText = op
document.getElementById("opTips").value = opTips
tb.style.display = "block"
}
function calc()
{
var x = parseInt(document.getElementById("x").value)
var y = parseInt(document.getElementById("y").value)
var op = document.getElementById("op").innerText
var z = ""
switch(op)
{
case '+':
z = x + y
break
case '-':
z = x - y
break
case '*':
z = x * y
break
case '/':
z = x / y
break
default:
z = ''
}
console.log(x, op, y, '=', z)
document.getElementById("z").innerText = z
}
</script>
</body>
</html>
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