JavaScript制作简易计算器（不用eval）
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2022-06-08 16:37:04
本文实例为大家分享了js制作简易计算器的具体代码，供大家参考，具体内容如下
本文实例为大家分享了js制作简易计算器的具体代码，供大家参考，具体内容如下
<head>
<meta charset="utf-8">
<title>title</title>
<style type="text/css">
* {
padding: 0;
margin: 0;
}
li {
list-style: none;
}
body {
background: #940032;
}
#counter {
width: 500px;
height: 420px;
background: #939;
margin: 50px auto 0;
position: relative;
}
#counter h2 {
line-height: 42px;
padding-left: 15px;
font-size: 14px;
font-family: arial;
color: #ff3333;
}
#counter a {
font-weight: normal;
text-decoration: none;
color: #ff3333;
}
#counter a:hover {
text-decoration: underline;
}
#bg {
width: 280px;
height: 200px;
border: 3px solid #680023;
background: #990033;
filter: alpha(opacity=80);
opacity: 0.8;
position: absolute;
left: 50%;
top: 115px;
margin-left: -141px;
}
#counter_content {
width: 250px;
position: absolute;
top: 130px;
left: 130px;
z-index: 1;
}
#counter_content h3 {
margin-bottom: 10px;
}
#counter_content h3 input {
border: none;
width: 223px;
height: 30px;
line-height: 30px;
padding: 0 10px;
background: url(img/ico.png) no-repeat;
text-align: right;
color: #333;
font-size: 14px;
font-weight: bold;
}
#counter_content div {
width: 250px;
}
#counter_content input {
width: 60px;
height: 30px;
line-height: 30px;
float: left;
background: url(img/ico.png) no-repeat -303px 0;
text-align: center;
color: #fff;
cursor: pointer;
margin: 0 1px 4px 0;
border: 0;
}
#counter_content div > input:hover {
background: url(img/ico.png) no-repeat -243px 0;
}
#counter p {
width: 500px;
position: absolute;
bottom: 20px;
left: 0;
color: #ff3333;
text-align: center;
font-size: 12px;
}
</style>
</head>
<body>
<div id="counter">
<h2>简易计算</h2>
<div id="counter_content">
<h3><input id="input1" type="text" value="0"/></h3>
<div id="div1">
<input type="button" value="7" onclick="kick('7')"/>
<input type="button" value="8" onclick="kick('8')"/>
<input type="button" value="9" onclick="kick('9')"/>
<input type="button" value="+" onclick="kick('+')"/>
<input type="button" value="4" onclick="kick('4')"/>
<input type="button" value="5" onclick="kick('5')"/>
<input type="button" value="6" onclick="kick('6')"/>
<input type="button" value="-" onclick="kick('-')"/>
<input type="button" value="1" onclick="kick('1')"/>
<input type="button" value="2" onclick="kick('2')"/>
<input type="button" value="3" onclick="kick('3')"/>
<input type="button" value="*" onclick="kick('*')"/>
<input type="button" value="0" onclick="kick('0')"/>
<input type="button" value="c" onclick="kick('c')"/>
<input type="button" value="=" onclick="kick('=')"/>
<input type="button" value="/" onclick="kick('/')"/>
</div>
</div>
</div>
</body>
<script>
var showinput = document.getelementbyid("input1");
var isclear = false;
var tempstr = "";
var clactype = "";
var iscontinue = true;
function kick(clickvalue) {
switch (clickvalue) {
case "=":
if (tempstr != "" && clactype != "") {
showinput.value = clac(tempstr, showinput.value, clactype);
iscontinue = false;
clactype = "";
}
break;
case "+":
case "-":
case "*":
case "/":
//如果预存的操作符不为空 表示表示连续操作
if (clactype != "" && !iscontinue) { //先执行计算
tempstr = clac(tempstr, showinput.value, clactype);
isclear = true;
clactype = clickvalue;
} else {
tempstr = showinput.value; //点击操作符之后 预存字符
isclear = true;//表示点击了操作符
clactype = clickvalue;//预存操作符
}
iscontinue = true;
break;
case "c":
showinput.value = "0";
isclear = false;
tempstr = "";
clactype = "";
break;
default://普通的数字按钮点击
showinput.value = showinput.value == "0" ? "" : showinput.value;
iscontinue = false;
if (isclear) {
showinput.value = "";
showinput.value += clickvalue;
isclear = false;
} else {
showinput.value += clickvalue;
}
break;
}
}
function clac(num1, num2, type) {
switch (type) {
case "+":
return number(num1) + number(num2);
case "-":
return number(num1) - number(num2);
case "*":
return number(num1) * number(num2);
case "/":
return number(num1) / number(num2);
default:
break;
}
}
</script>
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。