网页计算器怎么实现
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第一种方式:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title></title>
<script src="Styles/jquery-1.4.1.min.js" type="text/javascript"></script>
<script type="text/javascript">
$(function () {
$("#btnEquals").click(function () {
var txt1 = $("#txt1").val() - 0;
var txt2 = $("#txt2").val() - 0;
var sel = $("#sel").val();
var rec = 0;
switch (sel) {
case "+": rec = txt1 + txt2; break;
case "-": rec = txt1 - txt2; break;
case "*": rec = txt1 * txt2; break;
case "/": rec = txt1 / txt2; break;
}
// rec = new Function("return "+txt1+sel+txt2);
$("#txtResult").val(rec);
});
});
</script>
</head>
<body>
<input type="text" id="txt1" value="" />
<select id="sel">
<option>+</option>
<option>-</option>
<option>*</option>
<option>/</option>
</select>
<input type="text" id="txt2" value="" />
<input type="button" id="btnEquals" value="=" />
<input type="text" id="txtResult" value="" />
</body>
</html>
第二种方式:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title></title>
<script src="Styles/jquery-1.4.1.min.js" type="text/javascript"></script>
<script type="text/javascript">
$(function () {
$("#btnEquals").click(function () {
var txt1 = $("#txt1").val() - 0;
var txt2 = $("#txt2").val() - 0;
var sel = $("#sel").val();
var rec = 0;
// switch (sel) {
// case "+": rec = txt1 + txt2; break;
// case "-": rec = txt1 - txt2; break;
// case "*": rec = txt1 * txt2; break;
// case "/": rec = txt1 / txt2; break;
// }
rec = new Function("return "+txt1+sel+txt2);
$("#txtResult").val(rec);
});
});
</script>
</head>
<body>
<input type="text" id="txt1" value="" />
<select id="sel">
<option>+</option>
<option>-</option>
<option>*</option>
<option>/</option>
</select>
<input type="text" id="txt2" value="" />
<input type="button" id="btnEquals" value="=" />
<input type="text" id="txtResult" value="" />
</body>
</html>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title></title>
<script src="Styles/jquery-1.4.1.min.js" type="text/javascript"></script>
<script type="text/javascript">
$(function () {
$("#btnEquals").click(function () {
var txt1 = $("#txt1").val() - 0;
var txt2 = $("#txt2").val() - 0;
var sel = $("#sel").val();
var rec = 0;
switch (sel) {
case "+": rec = txt1 + txt2; break;
case "-": rec = txt1 - txt2; break;
case "*": rec = txt1 * txt2; break;
case "/": rec = txt1 / txt2; break;
}
// rec = new Function("return "+txt1+sel+txt2);
$("#txtResult").val(rec);
});
});
</script>
</head>
<body>
<input type="text" id="txt1" value="" />
<select id="sel">
<option>+</option>
<option>-</option>
<option>*</option>
<option>/</option>
</select>
<input type="text" id="txt2" value="" />
<input type="button" id="btnEquals" value="=" />
<input type="text" id="txtResult" value="" />
</body>
</html>
第二种方式:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title></title>
<script src="Styles/jquery-1.4.1.min.js" type="text/javascript"></script>
<script type="text/javascript">
$(function () {
$("#btnEquals").click(function () {
var txt1 = $("#txt1").val() - 0;
var txt2 = $("#txt2").val() - 0;
var sel = $("#sel").val();
var rec = 0;
// switch (sel) {
// case "+": rec = txt1 + txt2; break;
// case "-": rec = txt1 - txt2; break;
// case "*": rec = txt1 * txt2; break;
// case "/": rec = txt1 / txt2; break;
// }
rec = new Function("return "+txt1+sel+txt2);
$("#txtResult").val(rec);
});
});
</script>
</head>
<body>
<input type="text" id="txt1" value="" />
<select id="sel">
<option>+</option>
<option>-</option>
<option>*</option>
<option>/</option>
</select>
<input type="text" id="txt2" value="" />
<input type="button" id="btnEquals" value="=" />
<input type="text" id="txtResult" value="" />
</body>
</html>
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