<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<style>
* {
margin: 0;
padding: 0;
box-sizing: border-box;
font: 14px Arial, sans-serif;
}
html {
height: 100%;
background-color: lightslategrey;
}
#calculator {
margin: 15px auto;
width: 330px;
height: 400px;
border: 1px solid lightgray;
background-color: darkgrey;
padding: 15px;
}
/*LOGO*/
.LOGO {
height: 30px;
}
.LOGO .name {
margin: 0 100px;
line-height: 30px;
}
/*screen*/
#shuRu {
margin-top: 15px;
}
.screen {
margin-top: 5px;
width: 300px;
height: 40px;
text-align: right;
padding-right: 10px;
font-size: 20px;
}
#keys {
border: 1px solid lightgray;
height: 223px;
margin-top: 25px;
padding: 8px;
}
#keys .last {
margin-right: 0px;
}
#keys .buttons {
float: left;
width: 42px;
height: 36px;
text-align: center;
background-color: lightgray;
margin: 0 17px 20px 0;
}
</style>
</head>
<body>
<div id="calculator">
<div class="LOGO">
<span class="name">简单的计算器</span>
</div>
<div id="shuRu">
<!--screen输入栏-->
<div class="screen">
<input type="text" id="screenName" name="screenName" class="screen">
</div>
</div>
<div id="keys">
<!--第一排-->
<input type="button" id="7" onclick="jsq(this.id)" value="7" class="buttons">
<input type="button" id="8" onclick="jsq(this.id)" value="8" class="buttons">
<input type="button" id="9" onclick="jsq(this.id)" value="9" class="buttons">
<input type="button" id="Back" onclick="tuiGe()" value="Back" class="buttons">
<input type="button" id="C" onclick="clearNum()" value="C" class="buttons" style="margin-right:0px">
<!--第二排-->
<input type="button" id="4" onclick="jsq(this.id)" value="4" class="buttons">
<input type="button" id="5" onclick="jsq(this.id)" value="5" class="buttons">
<input type="button" id="6" onclick="jsq(this.id)" value="6" class="buttons">
<input type="button" id="*" onclick="jsq(this.id)" value="*" class="buttons">
<input type="button" id="/" onclick="jsq(this.id)" value="/" class="buttons" style="margin-right:0px">
<!--第三排-->
<input type="button" id="1" onclick="jsq(this.id)" value="1" class="buttons">
<input type="button" id="2" onclick="jsq(this.id)" value="2" class="buttons">
<input type="button" id="3" onclick="jsq(this.id)" value="3" class="buttons">
<input type="button" id="+" onclick="jsq(this.id)" value="+" class="buttons">
<input type="button" id="-" onclick="jsq(this.id)" value="-" class="buttons" style="margin-right:0px">
<!--第四排-->
<input type="button" id="0" onclick="jsq(this.id)" value="0" class="buttons">
<input type="button" id="00" onclick="jsq(this.id)" value="00" class="buttons">
<input type="button" id="." onclick="jsq(this.id)" value="." class="buttons">
<input type="button" id="%" onclick="jsq(this.id)" value="%" class="buttons">
<input type="button" id="eva" onclick="eva()" value="=" class="buttons" style="margin-right:0px">
</div>
</div>
</body>
<script>
function jsq(num) {
console.log(num);
//获取当前输入
if (num == "%") {
document.getElementById('screenName').value = Math.round(document.getElementById('screenName').value) / 100;
} else {
document.getElementById('screenName').value += document.getElementById(num).value;
}
}
function eva() {
//计算输入结果
// var res=document.getElementById("screenName").value;
// console.log(res);
// document.getElementById("screenName").value=eval(res)
document.getElementById("screenName").value = eval(document.getElementById('screenName').value);
}
function clearNum() {
//清0
document.getElementById("screenName").value = null;
document.getElementById("screenName").focus();
}
function tuiGe() {
//退格
var arr = document.getElementById("screenName");
arr.value = arr.value.substring(0, arr.value.length - 1);
}
</script>
</html>