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html 代码
<!DOCTYPE html>
<html lang=”en”>
<head>
<meta charset=”UTF-8″ />
<title>04-00-计算器</title>
<style>
* {
margin: 0;
padding: 0;
left: 0;
top: 0;
list-style: none;
}
ul {
margin: 50px;
margin-top: 20px;
width: 280px;
}
ul li {
float: left;
width: 45px;
height: 45px;
border: 1px solid #aaa;
margin: 10px;
text-align: center;
line-height: 45px;
font-family: 微软雅黑;
font-size: 16px;
font-weight: bolder;
cursor: pointer;
}
ul li:nth-child(3),
ul li:nth-last-child(3) {
width: 110px;
}
.r {
width: 244px;
height: 80px;
border: 1px solid #aaa;
margin-top: 50px;
margin-left: 60px;
font-family: 微软雅黑;
font-size: 20px;
text-align: right;
line-height: 80px;
overflow: hidden;
/*overflow-x: scroll;*/
}
</style>
<!–
–>
</head>
<body>
<div class=”r”></div>
<ul>
<li>退格</li>
<li>C</li>
<li>=</li>
<li>1</li>
<li>2</li>
<li>3</li>
<li>+</li>
<li>4</li>
<li>5</li>
<li>6</li>
<li>-</li>
<li>7</li>
<li>8</li>
<li>9</li>
<li>*</li>
<li>0</li>
<li>.</li>
<li>/</li>
</ul>
<script>
var lis = document.querySelectorAll(‘ul li’)
var r = document.querySelector(‘.r’)
for (var i = 0; i < lis.length; i++) {
lis[i].onclick = function() {
/* body… */
var ih = this.innerHTML
var rh = r.innerHTML
var oper = [‘+’, ‘-‘, ‘*’, ‘/’]
switch (ih) {
case ‘退格’:
// statements_1
rh = rh.slice(0, -1)
console.log(rh)
r.innerHTML = rh
break
case ‘C’:
r.innerHTML = ”
break
case ‘=’:
var result = eval(r.innerHTML) //eval:执行js代码
var haha = result – parseInt(result)
console.log(haha)
if (haha > 0) {
r.innerHTML = result.toFixed(2)
// 保留两位小数并四舍五入
} else {
console.log(result)
r.innerHTML = result
}
//保留两位小数
break
case ‘*’:
case ‘/’:
var lc = rh.slice(-1)
if (rh == ” || oper.indexOf(lc) > -1) {
return
} else {
r.innerHTML += ih
}
// console.log(oper.indexOf(lc));
break
case ‘.’:
var zz = /[+*/-]/gi
var arrnumber = rh.split(zz)
var zzz = /\./gi
console.log(arrnumber)
var lc = rh.slice(-1)
// var narr = rh.split(); //用正则分割成数组
if (
!rh ||
isNaN(lc) ||
zzz.test(arrnumber[arrnumber.length – 1])
) {
return
} else {
r.innerHTML += ih
}
break
case ‘+’:
case ‘-‘:
var lc = rh.slice(-1)
// console.log(oper.indexOf(lc));
if (oper.indexOf(lc) > -1) {
return
} else {
r.innerHTML += ih
}
break
default:
r.innerHTML += ih
}
}
}
</script>
</body>
</html>
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