JS实现计算器，带三角函数，根号
极简主义网页计算器。
实现了按键特效，可响应键盘按键，实时显示计算结果。
可切换模式，拓展高级功能，包括根号、三角函数、括号等。
效果如下：
代码如下：
html：
<!DOCTYPE html>
<html lang="zh-CN">
<head>
<meta charset="utf-8">
<title>Calculator</title>
<link rel="stylesheet" href="css/main.css">
<link rel="stylesheet" href="css/reset.css">
<script src='js/main.js' type='text/javascript'></script>
</head>
<body onkeypress="keyboard();">
<div id="calculator">
<!--计算器主体框架-->
<div class="setting">
<!--计算器标头-->
<p class="head">Calculator</p>
</div>
<div class="display">
<!--显示界面-->
<input type="text" id="exp" class="expression" disabled>
<!--表达式区域-->
<input type="text" id="ans" class="answer" disabled>
<!--答案区域-->
</div>
<div class="keyboard">
<!--键盘-->
<ul>
<li onclick="model()">
M
</li>
<li onclick="append('C')">
C
</li>
<li onclick="append('B')">
B
</li>
<li onclick="append('/')">
/
</li>
<li onclick="append(1)">1
</li>
<li onclick="append(2)">2
</li>
<li onclick="append(3)">3
</li>
<li onclick="append('*')">
×
</li>
<li onclick="append(4)">4
</li>
<li onclick="append(5)">5
</li>
<li onclick="append(6)">6
</li>
<li onclick="append('-')">
-
</li>
<li onclick="append(7)">7
</li>
<li onclick="append(8)">8
</li>
<li onclick="append(9)">9
</li>
<li onclick="append('+')">
+
</li>
<li onclick="append('.')">.
</li>
<li onclick="append(0)">
0
</li>
<li onclick="plus_min();">
±
</li>
<li onclick="append('=')">
=
</li>
</ul>
</div>
</div>
<div id="expand">
<ul>
<li onclick="Sqrt();">
√
</li>
<li onclick="append('(')">
(
</li>
<li onclick="append(')')">
)
</li>
<li onclick="append('sin(')">
sin
</li>
<li onclick="append('cos(')">
cos
</li>
</ul>
</div>
</body>
</html>
<!--Made by Vincent Zhang 2017/07/10-->
Css：
main.css
body {
text-align: center;
-webkit-user-select: none;
-moz-user-select: none;
-ms-user-select: none;
user-select: none;
}
#calculator {
position: relative;
border: 2px solid black;
width: 320px;
height: 590px;
top: 20px;
margin: 0 auto;
}
.setting {
position: relative;
width: 100%;
height: 40px;
border: 0px solid black;
margin: 0 auto;
}
.head {
float: left;
margin: 0;
padding-left: 17px;
line-height: 40px;
}
.display {
position: relative;
width: 100%;
height: 200px;
border: 0px solid black;
margin: 0 auto;
}
.expression {
float: left;
margin: 0;
padding: 0;
position: relative;
width: 93%;
height: 70px;
border: 0px solid black;
margin: 0 auto;
text-align: right;
font-size: 30px;
color: #000;
overflow: hidden;
white-space: nowrap;
text-overflow: ellipsis;
border: 0;
outline: none;
background-color: #FFFFFF;
}
.answer {
float: left;
margin: 0;
padding: 0;
position: relative;
width: 93%;
height: 130px;
border: 0px solid black;
margin: 0 auto;
text-align: right;
font-size: 50px;
color: #000;
overflow: hidden;
white-space: nowrap;
text-overflow: ellipsis;
border: 0;
outline: none;
background-color: #FFFFFF;
}
.keyboard {
padding: 0;
position: relative;
float: right;
width: 320px;
height: 343px;
border: 0px solid black;
margin: 0 auto;
}
ul {
list-style: none;
padding: 0;
margin: 0;
}
ul li {
float: left;
display: block;
width: 80px;
height: 68px;
line-height: 68px;
padding: 0;
margin: 0;
text-decoration: none;
color: #000;
display: block;
cursor: pointer;
}
ul li:hover {
color: #000000;
background-color: rgb(230, 230, 230);
}
#expand {
position: absolute;
border: 0px solid black;
width: 80px;
height: 340px;
padding: 0;
margin: 0;
display: none;
}
reset,css
/*! normalize.css v7.0.0 | MIT License | github.com/necolas/normalize.css */
/* Document
========================================================================== */
/**
* 1. Correct the line height in all browsers.
* 2. Prevent adjustments of font size after orientation changes in
* IE on Windows Phone and in iOS.
*/
html {
line-height: 1.15;
/* 1 */
-ms-text-size-adjust: 100%;
/* 2 */
-webkit-text-size-adjust: 100%;
/* 2 */
}
/* Sections
========================================================================== */
/**
* Remove the margin in all browsers (opinionated).
*/
body {
margin: 0;
}
/**
* Add the correct display in IE 9-.
*/
article,
aside,
footer,
header,
nav,
section {
display: block;
}
/**
* Correct the font size and margin on `h1` elements within `section` and
* `article` contexts in Chrome, Firefox, and Safari.
*/
h1 {
font-size: 2em;
margin: 0.67em 0;
}
/* Grouping content
========================================================================== */
/**
* Add the correct display in IE 9-.
* 1. Add the correct display in IE.
*/
figcaption,
figure,
main {
/* 1 */
display: block;
}
/**
* Add the correct margin in IE 8.
*/
figure {
margin: 1em 40px;
}
/**
* 1. Add the correct box sizing in Firefox.
* 2. Show the overflow in Edge and IE.
*/
hr {
box-sizing: content-box;
/* 1 */
height: 0;
/* 1 */
overflow: visible;
/* 2 */
}
/**
* 1. Correct the inheritance and scaling of font size in all browsers.
* 2. Correct the odd `em` font sizing in all browsers.
*/
pre {
font-family: monospace, monospace;
/* 1 */
font-size: 1em;
/* 2 */
}
/* Text-level semantics
========================================================================== */
/**
* 1. Remove the gray background on active links in IE 10.
* 2. Remove gaps in links underline in iOS 8+ and Safari 8+.
*/
a {
background-color: transparent;
/* 1 */
-webkit-text-decoration-skip: objects;
/* 2 */
}
/**
* 1. Remove the bottom border in Chrome 57- and Firefox 39-.
* 2. Add the correct text decoration in Chrome, Edge, IE, Opera, and Safari.
*/
abbr[title] {
border-bottom: none;
/* 1 */
text-decoration: underline;
/* 2 */
text-decoration: underline dotted;
/* 2 */
}
/**
* Prevent the duplicate application of `bolder` by the next rule in Safari 6.
*/
b,
strong {
font-weight: inherit;
}
/**
* Add the correct font weight in Chrome, Edge, and Safari.
*/
b,
strong {
font-weight: bolder;
}
/**
* 1. Correct the inheritance and scaling of font size in all browsers.
* 2. Correct the odd `em` font sizing in all browsers.
*/
code,
kbd,
samp {
font-family: monospace, monospace;
/* 1 */
font-size: 1em;
/* 2 */
}
/**
* Add the correct font style in Android 4.3-.
*/
dfn {
font-style: italic;
}
/**
* Add the correct background and color in IE 9-.
*/
mark {
background-color: #ff0;
color: #000;
}
/**
* Add the correct font size in all browsers.
*/
small {
font-size: 80%;
}
/**
* Prevent `sub` and `sup` elements from affecting the line height in
* all browsers.
*/
sub,
sup {
font-size: 75%;
line-height: 0;
position: relative;
vertical-align: baseline;
}
sub {
bottom: -0.25em;
}
sup {
top: -0.5em;
}
/* Embedded content
========================================================================== */
/**
* Add the correct display in IE 9-.
*/
audio,
video {
display: inline-block;
}
/**
* Add the correct display in iOS 4-7.
*/
audio:not([controls]) {
display: none;
height: 0;
}
/**
* Remove the border on images inside links in IE 10-.
*/
img {
border-style: none;
}
/**
* Hide the overflow in IE.
*/
svg:not(:root) {
overflow: hidden;
}
/* Forms
========================================================================== */
/**
* 1. Change the font styles in all browsers (opinionated).
* 2. Remove the margin in Firefox and Safari.
*/
button,
input,
optgroup,
select,
textarea {
font-family: sans-serif;
/* 1 */
font-size: 100%;
/* 1 */
line-height: 1.15;
/* 1 */
margin: 0;
/* 2 */
}
/**
* Show the overflow in IE.
* 1. Show the overflow in Edge.
*/
button,
input {
/* 1 */
overflow: visible;
}
/**
* Remove the inheritance of text transform in Edge, Firefox, and IE.
* 1. Remove the inheritance of text transform in Firefox.
*/
button,
select {
/* 1 */
text-transform: none;
}
/**
* 1. Prevent a WebKit bug where (2) destroys native `audio` and `video`
* controls in Android 4.
* 2. Correct the inability to style clickable types in iOS and Safari.
*/
button,
html [type="button"],
/* 1 */
[type="reset"],
[type="submit"] {
-webkit-appearance: button;
/* 2 */
}
/**
* Remove the inner border and padding in Firefox.
*/
button::-moz-focus-inner,
[type="button"]::-moz-focus-inner,
[type="reset"]::-moz-focus-inner,
[type="submit"]::-moz-focus-inner {
border-style: none;
padding: 0;
}
/**
* Restore the focus styles unset by the previous rule.
*/
button:-moz-focusring,
[type="button"]:-moz-focusring,
[type="reset"]:-moz-focusring,
[type="submit"]:-moz-focusring {
outline: 1px dotted ButtonText;
}
/**
* Correct the padding in Firefox.
*/
fieldset {
padding: 0.35em 0.75em 0.625em;
}
/**
* 1. Correct the text wrapping in Edge and IE.
* 2. Correct the color inheritance from `fieldset` elements in IE.
* 3. Remove the padding so developers are not caught out when they zero out
* `fieldset` elements in all browsers.
*/
legend {
box-sizing: border-box;
/* 1 */
color: inherit;
/* 2 */
display: table;
/* 1 */
max-width: 100%;
/* 1 */
padding: 0;
/* 3 */
white-space: normal;
/* 1 */
}
/**
* 1. Add the correct display in IE 9-.
* 2. Add the correct vertical alignment in Chrome, Firefox, and Opera.
*/
progress {
display: inline-block;
/* 1 */
vertical-align: baseline;
/* 2 */
}
/**
* Remove the default vertical scrollbar in IE.
*/
textarea {
overflow: auto;
}
/**
* 1. Add the correct box sizing in IE 10-.
* 2. Remove the padding in IE 10-.
*/
[type="checkbox"],
[type="radio"] {
box-sizing: border-box;
/* 1 */
padding: 0;
/* 2 */
}
/**
* Correct the cursor style of increment and decrement buttons in Chrome.
*/
[type="number"]::-webkit-inner-spin-button,
[type="number"]::-webkit-outer-spin-button {
height: auto;
}
/**
* 1. Correct the odd appearance in Chrome and Safari.
* 2. Correct the outline style in Safari.
*/
[type="search"] {
-webkit-appearance: textfield;
/* 1 */
outline-offset: -2px;
/* 2 */
}
/**
* Remove the inner padding and cancel buttons in Chrome and Safari on macOS.
*/
[type="search"]::-webkit-search-cancel-button,
[type="search"]::-webkit-search-decoration {
-webkit-appearance: none;
}
/**
* 1. Correct the inability to style clickable types in iOS and Safari.
* 2. Change font properties to `inherit` in Safari.
*/
::-webkit-file-upload-button {
-webkit-appearance: button;
/* 1 */
font: inherit;
/* 2 */
}
/* Interactive
========================================================================== */
/*
* Add the correct display in IE 9-.
* 1. Add the correct display in Edge, IE, and Firefox.
*/
details,
/* 1 */
menu {
display: block;
}
/*
* Add the correct display in all browsers.
*/
summary {
display: list-item;
}
/* Scripting
========================================================================== */
/**
* Add the correct display in IE 9-.
*/
canvas {
display: inline-block;
}
/**
* Add the correct display in IE.
*/
template {
display: none;
}
/* Hidden
========================================================================== */
/**
* Add the correct display in IE 10-.
*/
[hidden] {
display: none;
}
JS:
var modelFlag = 0;
function append(str) {
if (str == 'C') {
exp.value = "";
ans.value = "";
} else if (str == 'B') {
cstr = String(exp.value);
cstr = cstr.substring(0, cstr.length - 1);
exp.value = cstr;
if (exp.value.length != 0)
caculate();
else
ans.value = "";
} else if (str == '=') {
caculate();
} else {
exp.value += str;
caculate();
}
}
function plus_min() {
cstr = String(exp.value);
if (cstr[0] == '-') {
cstr = cstr.substring(1, cstr.length);
exp.value = cstr;
caculate();
} else {
cstr = "-" + cstr;
exp.value = cstr;
caculate();
}
}
function caculate() {
expStr = String(exp.value);
while (expStr.search(/sin\((\S*)\)/) != -1) {
contant = expStr.match(/sin\(([^\)]*)\)/);
expStr = expStr.replace(contant[0], String(Math.sin(parseFloat(contant[1]) / 180 * Math.PI)));
}
while (expStr.search(/cos\((\S*)\)/) != -1) {
contant = expStr.match(/cos\(([^\)]*)\)/);
expStr = expStr.replace(contant[0], String(Math.cos(parseFloat(contant[1]) / 180 * Math.PI)));
}
if (expStr.length == 0) {
ans.value = "0";
} else {
ans.value = eval(expStr);
}
}
function keyboard() {
key = window.event.keyCode;
if (key >= 45 && key <= 57) {
append(String.fromCharCode(key));
} else if (key >= 40 && key <= 43) {
append(String.fromCharCode(key));
} else if (key == 13) {
caculate();
} else if (key == 8) {
append('B');
}
}
function model() {
if (modelFlag == 0) {
document.getElementById("calculator").style.width = "400px";
document.getElementById("expand").style.top = String(document.getElementById("calculator").offsetTop + 242) + "px";
document.getElementById("expand").style.left = String(document.getElementById("calculator").offsetLeft + 2) + "px";
document.getElementById("expand").style.display = "block";
modelFlag = 1;
} else {
document.getElementById("expand").style.display = "none";
document.getElementById("calculator").style.width = "320px";
modelFlag = 0;
}
}
function Sqrt() {
if (ans.value > 0) {
ans.value = Math.sqrt(ans.value);
exp.value = "";
} else {
ans.value = "Erro";
exp.value = "";
}
}
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