js css 实现简单的计算器
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>JS+CSS3实现计算器特效</title> <link type="text/css" rel="stylesheet" href="css/datouwang.css" /> </head>
<body> <div id="calculator">
<!-- Screen and clear key -->
<div class="top">
<span class="clear">C</span>
<div class="screen"></div>
</div>
<div class="keys">
<!-- operators and other keys -->
<span>7</span>
<span>8</span>
<span>9</span>
<span class="operator">+</span>
<span>4</span>
<span>5</span>
<span>6</span>
<span class="operator">-</span>
<span>1</span>
<span>2</span>
<span>3</span>
<span class="operator">÷</span>
<span>0</span>
<span>.</span>
<span class="eval">=</span>
<span class="operator">x</span>
</div>
</div>
<script src="js/datouwang.js" type="text/javascript"></script> </body>
</html>
// Get all the keys from document
var keys = document.querySelectorAll('#calculator span');
var operators = ['+', '-', 'x', '÷'];
var decimalAdded = false; // Add onclick event to all the keys and perform operations
for(var i = 0; i < keys.length; i++) {
keys[i].onclick = function(e) {
// Get the input and button values
var input = document.querySelector('.screen');
var inputVal = input.innerHTML;
var btnVal = this.innerHTML; // Now, just append the key values (btnValue) to the input string and finally use javascript's eval function to get the result
// If clear key is pressed, erase everything
if(btnVal == 'C') {
input.innerHTML = '';
decimalAdded = false;
} // If eval key is pressed, calculate and display the result
else if(btnVal == '=') {
var equation = inputVal;
var lastChar = equation[equation.length - 1]; // Replace all instances of x and ÷ with * and / respectively. This can be done easily using regex and the 'g' tag which will replace all instances of the matched character/substring
equation = equation.replace(/x/g, '*').replace(/÷/g, '/'); // Final thing left to do is checking the last character of the equation. If it's an operator or a decimal, remove it
if(operators.indexOf(lastChar) > -1 || lastChar == '.')
equation = equation.replace(/.$/, ''); if(equation)
input.innerHTML = eval(equation); decimalAdded = false;
} // Basic functionality of the calculator is complete. But there are some problems like
// 1. No two operators should be added consecutively.
// 2. The equation shouldn't start from an operator except minus
// 3. not more than 1 decimal should be there in a number // We'll fix these issues using some simple checks // indexOf works only in IE9+
else if(operators.indexOf(btnVal) > -1) {
// Operator is clicked
// Get the last character from the equation
var lastChar = inputVal[inputVal.length - 1]; // Only add operator if input is not empty and there is no operator at the last
if(inputVal != '' && operators.indexOf(lastChar) == -1)
input.innerHTML += btnVal; // Allow minus if the string is empty
else if(inputVal == '' && btnVal == '-')
input.innerHTML += btnVal; // Replace the last operator (if exists) with the newly pressed operator
if(operators.indexOf(lastChar) > -1 && inputVal.length > 1) {
// Here, '.' matches any character while $ denotes the end of string, so anything (will be an operator in this case) at the end of string will get replaced by new operator
input.innerHTML = inputVal.replace(/.$/, btnVal);
} decimalAdded =false;
} // Now only the decimal problem is left. We can solve it easily using a flag 'decimalAdded' which we'll set once the decimal is added and prevent more decimals to be added once it's set. It will be reset when an operator, eval or clear key is pressed.
else if(btnVal == '.') {
if(!decimalAdded) {
input.innerHTML += btnVal;
decimalAdded = true;
}
} // if any other key is pressed, just append it
else {
input.innerHTML += btnVal;
} // prevent page jumps
e.preventDefault();
}
}
/* Basic reset */
* {
margin: 0;
padding: 0;
box-sizing: border-box; /* Better text styling */
font: bold 14px Arial, sans-serif;
} /* Finally adding some IE9 fallbacks for gradients to finish things up */ /* A nice BG gradient */
html {
height: 100%;
background: white;
background: radial-gradient(circle, #fff 20%, #ccc);
background-size: cover;
} /* Using box shadows to create 3D effects */
#calculator {
width: 325px;
height: auto; margin: 100px auto;
padding: 20px 20px 9px; background: #9dd2ea;
background: linear-gradient(#9dd2ea, #8bceec);
border-radius: 3px;
box-shadow: 0px 4px #009de4, 0px 10px 15px rgba(0, 0, 0, 0.2);
} /* Top portion */
.top span.clear {
float: left;
} /* Inset shadow on the screen to create chinaz */
.top .screen {
height: 40px;
width: 212px; float: right; padding: 0 10px; background: rgba(0, 0, 0, 0.2);
border-radius: 3px;
box-shadow: inset 0px 4px rgba(0, 0, 0, 0.2); /* Typography */
font-size: 17px;
line-height: 40px;
color: white;
text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.2);
text-align: right;
letter-spacing: 1px;
} /* Clear floats */
.keys, .top {overflow: hidden;} /* Applying same to the keys */
.keys span, .top span.clear {
float: left;
position: relative;
top: 0; cursor: pointer; width: 66px;
height: 36px; background: white;
border-radius: 3px;
box-shadow: 0px 4px rgba(0, 0, 0, 0.2); margin: 0 7px 11px 0; color: #888;
line-height: 36px;
text-align: center; /* prevent selection of text inside keys */
user-select: none; /* Smoothing out hover and active states using css3 transitions */
transition: all 0.2s ease;
} /* Remove right margins from operator keys */
/* style different type of keys (operators/evaluate/clear) differently */
.keys span.operator {
background: #FFF0F5;
margin-right: 0;
} .keys span.eval {
background: #f1ff92;
box-shadow: 0px 4px #9da853;
color: #888e5f;
} .top span.clear {
background: #ff9fa8;
box-shadow: 0px 4px #ff7c87;
color: white;
} /* Some hover effects */
.keys span:hover {
background: #9c89f6;
box-shadow: 0px 4px #6b54d3;
color: white;
} .keys span.eval:hover {
background: #abb850;
box-shadow: 0px 4px #717a33;
color: #ffffff;
} .top span.clear:hover {
background: #f68991;
box-shadow: 0px 4px #d3545d;
color: white;
} /* Simulating "pressed" effect on active state of the keys by removing the box-shadow and moving the keys down a bit */
.keys span:active {
box-shadow: 0px 0px #6b54d3;
top: 4px;
} .keys span.eval:active {
box-shadow: 0px 0px #717a33;
top: 4px;
} .top span.clear:active {
top: 4px;
box-shadow: 0px 0px #d3545d;
}
版权声明：本文博主原创文章，博客，未经同意不得转载。
js css 实现简单的计算器的更多相关文章
- JS实现一个简单的计算器
使用JS完成一个简单的计算器功能.实现2个输入框中输入整数后,点击第三个输入框能给出2个整数的加减乘除.效果如上: 第一步: 创建构建运算函数count(). 第二步: 获取两个输入框中的值和获取选择 ...
- JS事件 编程练习-自制计算器 使用JS完成一个简单的计算器功能。实现2个输入框中输入整数后，点击第三个输入框能给出2个整数的加减乘除。
编程练习 使用JS完成一个简单的计算器功能.实现2个输入框中输入整数后,点击第三个输入框能给出2个整数的加减乘除. 提示:获取元素的值设置和获取方法为:例:赋值:document.getElement ...
- JS+CSS+HTML简单计算器
<!doctype html> <html> <head> <title>计算器</title> <meta charset=&quo ...
- JS CSS 网页 简单 右侧 悬浮
<!--右侧效果--> <script> $().ready(function() { $(".orm").hover(function() { $(thi ...
- 用JS,做一个简单的计算器
<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title&g ...
- js+css制作简单的轮播图带有定时功能
用纯css和JavaScript代码制作带有定时轮播功能的轮播图 <!DOCTYPE html> <html> <head> <meta charset=&q ...
- js+css实现简单下拉菜单
<head> <meta http-equiv="Content-Type" content="text/html; charset=gb2312&qu ...
- js制作简单的计算器
学着做了一个简单的计算器!记录记录!哈哈 <!DOCTYPE html> <html> <head> <title>简单的计算器</title&g ...
- JS+css滑动菜单简单实现
JS+css滑动菜单 制作一个简单的滑动菜单,当鼠标指向菜单标题时,滑出二级菜单.移开时二级菜单隐藏.目标很简单,实践时有一些细节需要注意,比如鼠标移向二级菜单的 过程中,二级菜单消失了.还有定位出错 ...
随机推荐
- [Firebase] Firebase Cloud Functions
Firebase cloud functions is similar to AWS lambda or serverless. You can deploy you code which wrote ...
- 图解String类型的不可变性及其原因
1.String的不可变性 String s="abcd": 上面的语句定义了一个字符串变量s.该变量指向字符串"abcd",当初始化变量s时,会在堆中为s非配 ...
- Dcloud课程7 单例模式一般用在什么场景
Dcloud课程7 单例模式一般用在什么场景 一.总结 一句话总结:连接数据库,这样就保证了和数据之间只有一个连接,从而能够不占用多余资源,这样就极大的减少了资源浪费,减少了mysql或者说服务器压力 ...
- eclipse 使用jetty调试时，加依赖工程的源码调试方法
[1] 添加source eclipse-->debug as-->debug configurations-->source [2]若source不起作用 重新编译一下,mvn c ...
- POJ 3723 Conscription MST
http://poj.org/problem?id=3723 题目大意: 需要征募女兵N人,男兵M人,没征募一个人需要花费10000美元,但是如果已经征募的人中有一些关系亲密的人,那么可以少花一些钱, ...
- jmeter--响应断言
背景 在测试过程中,我们需要对某个请求的结果进行判定. 比如我们搜索“你好”,请求发送成功,返回响应码也是200,但是并不能说明返回的响应就是对的,我们可能还需要判定响应结果包含“你好”.这个时候,我 ...
- mysql 配置，还得多看看～
http://blog.chinaunix.net/uid-20639775-id-154429.html
- linux内核头文件 cdev.h 解析
遇到一个内核API--cdev_init 就找到这里来了. #ifndef _LINUX_CDEV_H #define _LINUX_CDEV_H #include <linux/kobject ...
- IOS蓝牙项目总结
常见的蓝牙标准有2.0和4.0. 特点 2.0 1.适用于数据量比较大得传输,比如音乐.语音2.IOS开发中,要求设备是经过MFI认证 4.0 1.适用于实时性比较高的数据传输,比如遥控类的鼠标. ...
- Android Java Mail与Apache Mail发送邮件对比
原文链接: 一.邮件简介 一封邮件由很多信息构成,主要的信息如下,其他的暂时不考虑,例如抄送等: 1.收件人:收件人的邮箱地址,例如xxx@xx.com 2.收件人姓名:大部分的邮件显示时都会显 ...