var a = {ma}
var b = {mx}
var c = a/b
alert(c)
</script>
<!DOCTYPE html><html>
<head>
<meta http-equiv="Content-Type" content="text/html charset=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>
实现的步骤，第一步是加4个按钮，如图所示：
第二步需要加两个输入框，两个，一个按钮
<!DOCTYPE html><html>
<head>
<meta http-equiv="content-type" content="text/htmlcharset=utf-8" />
<title>jQuery</title>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.4.2/jquery.min.js"></script>
<script type="text/javascript">
$(document).ready(function(){
$("input#aaa").change(function(){
var num = $("input#aaa").val()
if(num != '')
{
if(num%7==0)
alert("能被7整除")
else
alert("不能被7整除")
}
})
})
</script>
</head>
<body>
<input id="aaa" />
</body>
</html>
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