<!DOCTYPE html>
<html lang="zh">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>js实现简单计算器</title>
<link rel="stylesheet" type="text/css" href="css/normalize.css" />
<link rel="stylesheet" href="css/style.css">
</head>
<body>
<h1>js实现简单计算器</h1>
<p class="warning">不要进行除0操作</p>
<div id="calculator" class="calculator">
<button id="clear" class="clear">C</button>
<div id="viewer" class="viewer">0</div>
<button class="num" data-num="7">7</button>
<button class="num" data-num="8">8</button>
<button class="num" data-num="9">9</button>
<button data-ops="加上" class="ops">+</button>
<button class="num" data-num="4">4</button>
<button class="num" data-num="5">5</button>
<button class="num" data-num="6">6</button>
<button data-ops="减去" class="ops">-</button>
<button class="num" data-num="1">1</button>
<button class="num" data-num="2">2</button>
<button class="num" data-num="3">3</button>
<button data-ops="乘以" class="ops">*</button>
<button class="num" data-num="0">0</button>
<button class="num" data-num=".">.</button>
<button id="equals" class="equals" data-result="">=</button>
<button data-ops="除以" class="ops">/</button>
</div>
<button id="reset" class="reset">Reset Universe?</button>
<script src="js/calculator.js" type="text/javascript"></script>
</body>
</html>
style.css
html {
background: #100a1c;
background-image: -webkit-radial-gradient(50% 30% ellipse at center top, #201e40 0%, rgba(0, 0, 0, 0) 100%), -webkit-radial-gradient(60% 50% ellipse at center bottom, #261226 0%, #100a1c 100%);
background-image: radial-gradient(50% 30% ellipse at center top, #201e40 0%, rgba(0, 0, 0, 0) 100%), radial-gradient(60% 50% ellipse at center bottom, #261226 0%, #100a1c 100%);
background-attachment: fixed;
color: #6cacc5;
}
body {
color: #6cacc5;
font: 300 18px/1.6 "Source Sans Pro",sans-serif;
margin: 0;
/*padding: 5em 0 2em;*/
text-align: center;
}
h2 {
font-weight: 300;
margin: 0;
}
/* Gradient text only on Webkit */
.warning {
background: -webkit-linear-gradient(45deg, #c97874 10%, #463042 90%);
-webkit-background-clip: text;
-webkit-text-fill-color: transparent;
color: #8c5059;
font-weight: 400;
margin: 0 auto 6em;
max-width: 9em;
}
.calculator {
font-size: 28px;
margin: 0 auto;
width: 10em;
}
.calculator::before, .calculator::after {
content: " ";
display: table;
}
.calculator::after {
clear: both;
}
/* Calculator after dividing by zero */
.broken {
-webkit-animation: broken 2s;
animation: broken 2s;
-webkit-transform: translate3d(0, -2000px, 0);
transform: translate3d(0, -2000px, 0);
opacity: 0;
}
.viewer {
color: #c97874;
float: left;
line-height: 3em;
text-align: right;
text-overflow: ellipsis;
overflow: hidden;
width: 7.5em;
height: 3em;
}
button {
border: 0;
background: rgba(42, 50, 113, 0.28);
color: #6cacc5;
cursor: pointer;
float: left;
font: inherit;
margin: 0.25em;
width: 2em;
height: 2em;
-webkit-transition: all 0.5s;
transition: all 0.5s;
}
button:hover {
background: #201e40;
}
button:focus {
outline: 0;
/* The value fade-ins that appear */
}
button:focus::after {
-webkit-animation: zoom 1s;
animation: zoom 1s;
-webkit-animation-iteration-count: 1;
animation-iteration-count: 1;
-webkit-animation-fill-mode: both;
animation-fill-mode: both;
content: attr(data-num);
cursor: default;
font-size: 100px;
position: absolute;
top: 1.5em;
left: 50%;
text-align: center;
margin-left: -24px;
opacity: 0;
width: 48px;
}
/* Same as above, modified for operators */
.ops:focus::after {
content: attr(data-ops);
margin-left: -210px;
width: 420px;
}
/* Same as above, modified for result */
.equals:focus::after {
content: attr(data-result);
margin-left: -300px;
width: 600px;
}
/* Reset button */
.reset {
background: rgba(201, 120, 116, 0.28);
color: #c97874;
font-weight: 400;
margin-left: -77px;
padding: 0.5em 1em;
position: absolute;
top: -20em;
left: 50%;
width: auto;
height: auto;
/* When button is revealed */
}
.reset:hover {
background: #c97874;
color: #100a1c;
}
.reset.show {
top: 20em;
-webkit-animation: fadein 4s;
animation: fadein 4s;
}
/* Animations */
/* Values that appear onclick */
@-webkit-keyframes zoom {
0% {
-webkit-transform: scale(0.2);
transform: scale(0.2);
opacity: 1;
}
70% {
-webkit-transform: scale(1);
transform: scale(1);
}
100% {
opacity: 0;
}
}
@keyframes zoom {
0% {
-webkit-transform: scale(0.2);
transform: scale(0.2);
opacity: 1;
}
70% {
-webkit-transform: scale(1);
transform: scale(1);
}
100% {
opacity: 0;
}
}
/* Division by zero animation */
@-webkit-keyframes broken {
0% {
-webkit-transform: translate3d(0, 0, 0);
transform: translate3d(0, 0, 0);
opacity: 1;
}
5% {
-webkit-transform: rotate(5deg);
transform: rotate(5deg);
}
15% {
-webkit-transform: rotate(-5deg);
transform: rotate(-5deg);
}
20% {
-webkit-transform: rotate(5deg);
transform: rotate(5deg);
}
25% {
-webkit-transform: rotate(-5deg);
transform: rotate(-5deg);
}
50% {
-webkit-transform: rotate(45deg);
transform: rotate(45deg);
}
70% {
-webkit-transform: translate3d(0, 2000px, 0);
transform: translate3d(0, 2000px, 0);
opacity: 1;
}
75% {
opacity: 0;
}
100% {
-webkit-transform: translate3d(0, -2000px, 0);
transform: translate3d(0, -2000px, 0);
}
}
@keyframes broken {
0% {
-webkit-transform: translate3d(0, 0, 0);
transform: translate3d(0, 0, 0);
opacity: 1;
}
5% {
-webkit-transform: rotate(5deg);
transform: rotate(5deg);
}
15% {
-webkit-transform: rotate(-5deg);
transform: rotate(-5deg);
}
20% {
-webkit-transform: rotate(5deg);
transform: rotate(5deg);
}
25% {
-webkit-transform: rotate(-5deg);
transform: rotate(-5deg);
}
50% {
-webkit-transform: rotate(45deg);
transform: rotate(45deg);
}
70% {
-webkit-transform: translate3d(0, 2000px, 0);
transform: translate3d(0, 2000px, 0);
opacity: 1;
}
75% {
opacity: 0;
}
100% {
-webkit-transform: translate3d(0, -2000px, 0);
transform: translate3d(0, -2000px, 0);
}
}
/* Reset button fadein */
@-webkit-keyframes fadein {
0% {
top: 20em;
opacity: 0;
}
50% {
opacity: 0;
}
100% {
opacity: 1;
}
}
@keyframes fadein {
0% {
top: 20em;
opacity: 0;
}
50% {
opacity: 0;
}
100% {
opacity: 1;
}
}
@media (min-width: 420px) {
.calculator {
width: 12em;
}
.viewer {
width: 8.5em;
}
button {
margin: 0.5em;
}
}
calculator.js(function() {
"use strict";
// Shortcut to get elements
var el = function(element) {
if (element.charAt(0) === "#") { // If passed an ID...
return document.querySelector(element); // ... returns single element
}
return document.querySelectorAll(element); // Otherwise, returns a nodelist
};
// Variables
var viewer = el("#viewer"), // Calculator screen where result is displayed
equals = el("#equals"), // Equal button
nums = el(".num"), // List of numbers
ops = el(".ops"), // List of operators
theNum = "", // Current number
oldNum = "", // First number
resultNum, // Result
operator; // Batman
// When: Number is clicked. Get the current number selected
var setNum = function() {
if (resultNum) { // If a result was displayed, reset number
theNum = this.getAttribute("data-num");
resultNum = "";
} else { // Otherwise, add digit to previous number (this is a string!)
theNum += this.getAttribute("data-num");
}
viewer.innerHTML = theNum; // Display current number
};
// When: Operator is clicked. Pass number to oldNum and save operator
var moveNum = function() {
oldNum = theNum;
theNum = "";
operator = this.getAttribute("data-ops");
equals.setAttribute("data-result", ""); // Reset result in attr
};
// When: Equals is clicked. Calculate result
var displayNum = function() {
// Convert string input to numbers
oldNum = parseFloat(oldNum);
theNum = parseFloat(theNum);
// Perform operation
switch (operator) {
case "加上":
resultNum = oldNum + theNum;
break;
case "减去":
resultNum = oldNum - theNum;
break;
case "乘以":
resultNum = oldNum * theNum;
break;
case "除以":
resultNum = oldNum / theNum;
break;
// If equal is pressed without an operator, keep number and continue
default:
resultNum = theNum;
}
// If NaN or Infinity returned
if (!isFinite(resultNum)) {
if (isNaN(resultNum)) { // If result is not a number; set off by, eg, double-clicking operators
resultNum = "You broke it!";
} else { // If result is infinity, set off by dividing by zero
resultNum = "Look at what you've done";
el('#calculator').classList.add("broken"); // Break calculator
el('#reset').classList.add("show"); // And show reset button
}
}
// Display result, finally!
viewer.innerHTML = resultNum;
equals.setAttribute("data-result", resultNum);
// Now reset oldNum & keep result
oldNum = 0;
theNum = resultNum;
};
// When: Clear button is pressed. Clear everything
var clearAll = function() {
oldNum = "";
theNum = "";
viewer.innerHTML = "0";
equals.setAttribute("data-result", resultNum);
};
/* The click events */
// Add click event to numbers
for (var i = 0, l = nums.length; i < l; i++) {
nums[i].onclick = setNum;
}
// Add click event to operators
for (var i = 0, l = ops.length; i < l; i++) {
ops[i].onclick = moveNum;
}
// Add click event to equal sign
equals.onclick = displayNum;
// Add click event to clear button
el("#clear").onclick = clearAll;
// Add click event to reset button
el("#reset").onclick = function() {
window.location = window.location;
};
}());