| 标签：JAVASCRIP计算器 | 分类：JAVASCRIPT |
下面是一个很好用的JAVASCRIPT计算器代码： <html> function backs(){ opt1=num.value; num.value=opt1.substring(0,opt1.lenght-1); } <body> </tr>
<head>
<style type="text/css">
<!--
table{border:4px double #0078F0;
background-repeat:repeat;
margin: 8px;
padding: 10px;
font-family: "隶书";
font-size: 12px;
color:#FF0000}
.aa{text-align:right}
.red {color: red}
-->
</style>
<script language="javascript" type="text/javascript">
<!--
var opt1,opt2,result;
var opt=0,newnum=true;
function a7(x){
if(x == "."){
number = num.value;
if(number.indexOf(".") != -1) {
x = "";
}
}
if(newnum == true){
num.value="";
}
if(num.value == "0"){
if(x == "."){
num.value += x;
}
else
num.value=x; }
else
num.value = num.value+x;
newnum=false;
}
function operation(op){
if(opt != 0)cal();
opt1=num.value;
opt=op;
newnum=true;
}
function cal(){
opt2=num.value;
switch(opt) {
case 1: result=parseFloat(opt1)+parseFloat(opt2);
break;
case 2: result=parseFloat(opt1)-parseFloat(opt2);
break;
case 3: result=parseFloat(opt1)*parseFloat(opt2);
break;
case 4: result=parseFloat(opt1)/parseFloat(opt2);
break;
default: }
num.value=result;
newnum=true; //结束一个运算的操作数
opt=opt1=opt2=0;
}
function clean(){
num.value="0";
opt1="";
opt2="";
opt=0;
}
function sqr(){
opt1=num.value;
if(opt1 >= 0){
result=Math.sqrt(parseFloat(opt1));
num.value=result; }
else
alert("Error!! 负数 不能开方！");
}
function qiudao(){
opt1=num.value;
if(opt1!= "0")
result=1/parseFloat(opt1);
else
alert("Error!! 0不能作为除数！");
num.value=result;
}
function qufu(){
opt1=num.value;
num.value = parseFloat(-opt1);
}
-->
</script>
</head>
<table align="center" cellspacing="0" cellpadding="0">
<tr><th colspan="5"><font size="+2" color="#FFA6D2" face="华文行楷">计 算 器</font></th></tr>
<tr align="center">
<td colspan="4" ><input class="aa" name="num" id="num" type="text" value="" size="25" /></td>
<td><input type="button" value="back " name="backs" onClick="backs()"></td>
</tr>
<tr align="center">
<td><input type="button" name="num7" value=" 7 " onClick="a7(7)" /></td>
<td><input type="button" name="num8" value=" 8 " onClick="a7(8)" /></td>
<td><input type="button" name="num9" value=" 9 " onClick="a7(9)" /></td>
<td><input class="red" type="button" name="chu" value=" / " onClick="operation(4)" /></td>
<td><input type="button" name="sqrt" value="sqrt " onClick="sqr()" /></td>
<tr align="center">
<td><input type="button" name="num4" value=" 4 " onClick="a7(4)" /></td>
<td><input type="button" name="num5" value=" 5 " onClick="a7(5)" /></td>
<td><input type="button" name="num6" value=" 6 " onClick="a7(6)" /></td>
<td><input class="red" type="button" name="cheng" value=" * " onClick="operation(3)" /></td>
<td><input type="button" name="zhengfu" value=" +/- " onClick="qufu()" /></td>
</tr>
<tr align="center">
<td><input type="button" name="num1" value=" 1 " onClick="a7(1)" /></td>
<td><input type="button" name="num2" value=" 2 " onClick="a7(2)" /></td>
<td><input type="button" name="num3" value=" 3 " onClick="a7(3)" /></td>
<td><input class="red" type="button" name="jian" value=" - " onClick="operation(2)" /></td>
<td><input type="button" name="1/x" value=" 1/x " onClick="qiudao()" /></td>
</tr>
<tr align="center">
<td><input type="button" name="num0" value=" 0 " onClick="a7(0)" /></td>
<td><input class="red" type="button" name="deng" value=" = " onClick="cal()" /></td>
<td><input class="red"type="reset" name="kong" value=" C " onClick="clean()" /></td>
<td><input class="red" type="button" name="jia" value=" + " onClick="operation(1)" /></td>
<td><input type="button" name="dian" value=" . " onClick="a7('.')" /></td>
</tr>
</table>
</body>
</html>P>
