代码发给你。PS我
<form action="javascipt:"><input type="text" id="aval" />
<input type="text" id="bval" />
<input type="text" id="cval" />
<button onclick="calc()">计算</button>
</form>
<script type="text/javascript">
function G(id) {
return document.getElementById(id)
}
function calc() {
var aval = parseInt(G('aval').value)*100
var bval = parseInt(G('bval').value)*100
G('cval').value = bval - aval
}
</script>
我给你看下我自己写的一个计算器的代码吧！你要实现求和的话！必须要用javaScript，下面是代码内容：<html><head>
<title>计算器</title>
<style>*{ font-size:12px}
body{ background-color:buttonfaceborder-style:none}
.button{ width:50pxheight:30px}
.button1{ width:90pxheight:30px}
#result{ width:100%cursor:defaulttext-align:right}</style>
<script type="text/javascript">
window.onbeforeunload=function(){return("离开你会后悔的")void(0)<br> }function a(i){
switch(i){
case 11:i="/"break
case 12:i="*"break
case 13:i="-"break
case 14:i="+"break
case 15:i="."break
}
document.getElementById("result").value=document.getElementById("result").value+i
} function calc(){
try{
document.getElementById("result").value = eval(document.getElementById("result").value)
}catch(e){
document.getElementById("result").value = "错误的算式"
}
}</script></head><body style="overflow:auto">
<table border="" bgcolor="#00FF00">
<!--DWLayoutTable-->
<tr>
<td height="20" colspan="4" valign="top"><input name="Input" id="result" size="18"></td>
</tr>
<tr>
<td><input type="button" value=" 7 " id="7" onClick="a(7)" class="button"></td>
<td><input type="button" value=" 8 " id="8" onClick="a(8)" class="button"></td>
<td><input type="button" value=" 9 " id="9" onClick="a(9)" class="button"></td>
<td><input type="button" value=" / " id="/" onClick="a(11)" class="button"></td>
</tr>
<tr>
<td height="25"><input type="button" value=" 4 " id="4" onClick="a(4)" class="button"></td>
<td><input type="button" value=" 5 " id="5" onClick="a(5)" class="button"></td>
<td><input type="button" value=" 6 " id="6" onClick="a(6)" class="button"></td>
<td><input type="button" value=" * " id="*" onClick="a(12)" class="button"></td>
</tr>
<tr>
<td height="25"><input type="button" value=" 1 " id="1" onClick="a(1)" class="button"></td>
<td><input type="button" value=" 2 " id="2" onClick="a(2)" class="button"></td>
<td><input type="button" value=" 3 " id="3" onClick="a(3)" class="button"></td>
<td><input type="button" value=" - " id="" onClick="a(13)" class="button"></td>
</tr>
<tr>
<td height="25"><input type="button" value=" 0 " id="0" onClick="a(0)" class="button"></td>
<td><input type="button" value=" . " id="." onClick="a(15)" class="button"></td>
<td><input name="button" type="button" id="=" value=" = " onClick="calc()" class="button"></td>
<td><input type="button" value=" + " id="+" onClick="a(14)" class="button"></td>
</tr>
</table>
</body>
</html>
function sum1() {var total = 0
var arr = document.getElementsByName("item")
for (var i=0i<arr.lengthi++) {
total += parseInt(arr[i].value)
}
var ssum=total+"yuan"
alert(ssum)
}
function show() {
var brrs = document.getElementsByName("item")
for (var i=0i<arr.lengthi++) {
brrs[i].checked =true
}
}
选取HTML元素最好别用for in，他会把一些DOM对象也选进去。
