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  • 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;
         320px;
        height: 590px;
        top: 20px;
        margin: 0 auto;
    }
    
    .setting {
        position: relative;
         100%;
        height: 40px;
        border: 0px solid black;
        margin: 0 auto;
    }
    
    .head {
        float: left;
        margin: 0;
        padding-left: 17px;
        line-height: 40px;
    }
    
    .display {
        position: relative;
         100%;
        height: 200px;
        border: 0px solid black;
        margin: 0 auto;
    }
    
    .expression {
        float: left;
        margin: 0;
        padding: 0;
        position: relative;
         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;
         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;
         320px;
        height: 343px;
        border: 0px solid black;
        margin: 0 auto;
    }
    
    ul {
        list-style: none;
        padding: 0;
        margin: 0;
    }
    
    ul li {
        float: left;
        display: block;
         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;
         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- 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 = "";
        }
    }

    如果对你有所帮助,亲点个推荐和关注,谢谢。

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  • 原文地址:https://www.cnblogs.com/smileZAZ/p/14156100.html
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