<!DOCTYPE html>
<html>
<head>
<title>计算器</title>
<style type="text/css">
*{
margin:0;
padding:0;
box-sizing: border-box;
font: 18px Arial,sans-serif;
}
body{
height:100%;
background-color:lightslategrey;
}
#calculator{
margin: 15px auto;
width:330px;
height:400px;
border: 1px solid lightgray;
border-radius:32px;
background-color:pink;
padding:15px;
}
.LOGO{
height:8px;
}
.circle{
height:16px;
width:16px;
border-radius:12px;
margin-right: 16px;
background-color:lightgrey;
border:1px solid black;
display:inline-block;
}
input{
background-color: lightskyblue;
}
.screen{
margin-top:15px;
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 .buttons{
float:left;
width: 42px;
height: 36px;
border-radius:12px;
text-align:center;
background-color:lightgray;
margin: 0 17px 20px 0;
}
</style>
</head>
<body onload="onLoad()">
<div id="calculator">
<div class="LOGO">
<div class="circle"></div>
<div class="circle"></div>
<div class="circle"></div>
❤ ❤ ❤ ❤ ❤ ❤ ❤ ✌
</div>
<!--输入栏-->
<div class="screen">
<input type="text"id="screenName" name="screenName" class="screen" value="" onkeyup="deleteEq()" onkeydown="onInput()"/>
</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="clearOne()" value="⇦" class="buttons">
<input type="button" id="C" onclick="clearAll()" value="AC" 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" onck="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="eq()" value="=" class="buttons" style="margin-right:0px">
</div>
</div>
</body>
<script>
var num = 0; // 定义第一个输入的数据
function onInput(){
if(event.keyCode==187){
eq();
}
}
function deleteEq(){
if(event.keyCode==187){
var temp=document.getElementById('screenName').value;
document.getElementById('screenName').value=temp.substr(0,temp.length-1);
}
}
function jsq(num) {
//获取当前输入
document.getElementById('screenName').value += document.getElementById(num).value;
}
function eq() {
//计算输入结果
document.getElementById("screenName").value = eval(document.getElementById("screenName").value);
}
function clearAll() {
//清0
document.getElementById("screenName").value = null;
document.getElementById("screenName").focus();
}
function clearOne() {
//退格
var arr = document.getElementById("screenName");
arr.value = arr.value.substring(0, arr.value.length - 1);
}
function onLoad(){
//加载完毕后光标自动对应到输入框
document.getElementById("screenName").focus();
}
</script>
</html>
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