HTML+CSS+JavaScript写计算器

思维导图：

代码(HTML)

	
		
		
		
	
	
		
			
				
					C
				
				0
			
			
				7
				8
				9
				+
				
				4
				5
				6
				*
				
				1
				2
				3
				-
				
				0
				.
				/
				=
			
		
	
	

CSS

#all{
	background-color: rgb(202,255,112,0.9);
	width: 300px;
	padding:20px 40px;
	border-radius: 25px;
	display: flex;
	flex-direction: column;
	position: relative;
}
#up{
	width: 100%;
	display: flex;
	width: 30%;
}
#screen{
	position: absolute;
	width: 165px;
	height: 50px;
	left:120px;
	top:20px;
	margin: 9px 8px;
	border: 1px solid black; 
	background-color: rgb(162,205,90,0.9);
	border-radius: 10px;
	box-shadow: 5px 5px 5px #888888;
	font-size: 10px;
	text-align: right;
	line-height: 70px;
}
#down{
	display: flex;
	flex-wrap: wrap;
	
}
#equal{
	background-color: rgb(105,139,34, 0.7);
	border-radius: 100px;
	font-size: 25px;
	padding: 10px 15px;
	margin: 10px 0px;
}
#divide{
	background-color: rgb(105,139,34, 0.7);
	border-radius: 100px;
	font-size: 25px;
	padding: 10px 15px;
	margin: 10px 20px;
}
.btn{
	background-color: rgb(105,139,34, 0.7);
	border-radius: 100px;
	font-size: 25px;
	padding: 10px 15px;
	margin: 10px 10px;
	box-shadow: 5px 5px 5px #888888;
	
}

效果图

 总结 ：花费时间一天半  中间存在bug  （小数处理问题  还有大于10的数问题） bug没有处理  只是刷js题  刷思路  完全自己的思路  敲之前没有任何借鉴  所以算法可能很差    重在记录

菜鸟教程上关于计算器的代码（效果和我差的不是一点半点哈哈哈   加油）

		HTML CSS, JavaScript 计算器
		
		

			
			
				

			
			
			
			
				

			
			
			
			
				

			
			
			
			
				

			
			
						
			
		
	

* {
	border: none;
	font-family: 'Open Sans', sans-serif;
	margin: 0;
	padding: 0;
}
body {

}
.center {
	background-color: #fff;
	border-radius: 50%;
	height: 600px;
	margin: auto;
	width: 600px;
}
h1 {
	color: #495678;
	font-size: 30px;	
	margin-top: 20px;
	padding-top: 50px;
	display: block;
	text-align: center;
	text-decoration: none;
}
a {
	color: #495678;
	font-size: 30px;	
	display: block;
	text-align: center;
	text-decoration: none;
	padding-top: 20px;
}
form {
	background-color: #495678;
	box-shadow: 4px 4px #3d4a65;
	margin: 40px auto;
	padding: 40px 0 30px 40px;	
	width: 280px;
}
.btn {
	outline: none;
	cursor: pointer;
	font-size: 20px;
	height: 45px;
	margin: 5px 0 5px 10px;
	width: 45px;
}
.btn:first-child {
	margin: 5px 0 5px 10px;
}
.btn, #display, form {
	border-radius: 25px;
}
#display {
	outline: none;
	background-color: #98d1dc;
	box-shadow: inset 6px 6px 0px #3facc0;
	color: #dededc;
	font-size: 20px;
	height: 47px;
	text-align: right;
	width: 165px;
	padding-right: 10px;
	margin-left: 10px;
}
.number {
	background-color: #72778b;
	box-shadow: 0 5px #5f6680;
	color: #dededc;
}
.number:active {
	box-shadow: 0 2px #5f6680;
  	-webkit-transform: translateY(2px);
  	-ms-transform: translateY(2px);
  	-moz-tranform: translateY(2px);
  	transform: translateY(2px);
}
.operator {
	background-color: #dededc;
	box-shadow: 0 5px #bebebe;
	color: #72778b;
}
.operator:active {
	box-shadow: 0 2px #bebebe;
  	-webkit-transform: translateY(2px);
  	-ms-transform: translateY(2px);
  	-moz-tranform: translateY(2px);
  	transform: translateY(2px);
}
.other {
	background-color: #e3844c;
	box-shadow: 0 5px #e76a3d;
	color: #dededc;
}
.other:active {
	box-shadow: 0 2px #e76a3d;
  	-webkit-transform: translateY(2px);
  	-ms-transform: translateY(2px);
  	-moz-tranform: translateY(2px);
  	transform: translateY(2px);
}

 
document.getElementById("clear").addEventListener("click", function() {
	document.getElementById("display").value = "";
});

function get(value) {
	document.getElementById("display").value += value; 
} 


function calculates() {
	var result = 0;
	result = document.getElementById("display").value;
	document.getElementById("display").value = "";
	document.getElementById("display").value = eval(result);
};

效果展示：