JS实现放大镜效果(放大图片)

注意：里边的两张图片(一大一小)可以自己添加，JQ采用jquery-1.11.3.js版，也可自行调换。

HTML代码：

<!DOCTYPE html>

<html>

<head lang="en">

    <meta charset="UTF-8">

    <title>jQuery放大镜</title>

    <link rel="stylesheet" href="css/reset.min.css"/>

    <link rel="stylesheet" href="css/index.css"/>

</head>

<body>

<div class="wrapper">

    <div class="small">

        <img src="img/1.jpg" alt=""/>

        <div class="mask"></div>

    </div>

    <div class="big">

        <img src="img/2.jpg" alt=""/>

    </div>

</div>

<script src="js/jquery-1.11.3.js"></script>

<script src="js/index.js"></script>

</body>

</html>

CSS代码：

@charset "UTF-8";

.wrapper{

    width: 800px;

    margin: 50px auto;

    position: relative;

}

.wrapper .small{

    position: absolute;

    top:;

    left:;

    width: 350px;

    height: 350px;

    border: 1px solid #000000;

    box-shadow: 3px 3px 5px #aaa;

}

.wrapper .small img{

    width: 100%;

    height: 100%;

}

.wrapper .small .mask{

    display: none;

    position: absolute;

    top:;

    left:;

    width: 150px;

    height: 150px;

    background-color: #000000;

    opacity: .4;

    cursor: move;

}

.wrapper .big{

    display: none;

    position: absolute;

    overflow: hidden;

    top:;

    left: 355px;

    border: 1px solid #000000;

    box-shadow: 3px 3px 5px #aaa;

}

.wrapper .big img{

    position: absolute;

    width: 800px;

    height: 800px;

    top:;

    left:;

}

reset.min.css文件：

body,h1,h2,h3,h4,h5,h6,hr,p,blockquote,dl,dt,dd,ul,ol,li,button,input,textarea,th,td{margin:;padding:}body{font-size:12px;font-style:normal;font-family:"\5FAE\8F6F\96C5\9ED1",Helvetica,sans-serif}small{font-size:12px}h1{font-size:18px}h2{font-size:16px}h3{font-size:14px}h4,h5,h6{font-size:100%}ul,ol{list-style:none}a{text-decoration:none;background-color:transparent}a:hover,a:active{outline-width:;text-decoration:none}table{border-collapse:collapse;border-spacing:}hr{border:;height:1px}img{border-style:none}img:not([src]){display:none}svg:not(:root){overflow:hidden}html{-webkit-touch-callout:none;-webkit-text-size-adjust:100%}input,textarea,button,a{-webkit-tap-highlight-color:rgba(0,0,0,0)}article,aside,details,figcaption,figure,footer,header,main,menu,nav,section,summary{display:block}audio,canvas,progress,video{display:inline-block}audio:not([controls]),video:not([controls]){display:none;height:}progress{vertical-align:baseline}mark{background-color:#ff0;color:#000}sub,sup{position:relative;font-size:75%;line-height:;vertical-align:baseline}sub{bottom:-0.25em}sup{top:-0.5em}button,input,select,textarea{font-size:100%;outline:}button,input{overflow:visible}button,select{text-transform:none}textarea{overflow:auto}button,html [type="button"],[type="reset"],[type="submit"]{-webkit-appearance:button}button::-moz-focus-inner,[type="button"]::-moz-focus-inner,[type="reset"]::-moz-focus-inner,[type="submit"]::-moz-focus-inner{border-style:none;padding:}button:-moz-focusring,[type="button"]:-moz-focusring,[type="reset"]:-moz-focusring,[type="submit"]:-moz-focusring{outline:1px dotted ButtonText}[type="checkbox"],[type="radio"]{box-sizing:border-box;padding:}[type="number"]::-webkit-inner-spin-button,[type="number"]::-webkit-outer-spin-button{height:auto}[type="search"]{-webkit-appearance:textfield;outline-offset:-2px}[type="search"]::-webkit-search-cancel-button,[type="search"]::-webkit-search-decoration{-webkit-appearance:none}::-webkit-input-placeholder{color:inherit;opacity:.54}::-webkit-file-upload-button{-webkit-appearance:button;font:inherit}.clear:after{display:block;height:;content:"";clear:both}

JS代码：

/**

 * Created by 35107 on 2017/5/8.

 */

$(function () {

    var smallL, smallT, minL = 0, minT = 0, maxL, maxT;

    var $wrapper = $('.wrapper'),

        $small = $wrapper.children('.small'),

        $mask = $small.children('.mask'),

        $big = $wrapper.children('.big'),

        $curImg = $small.children('img'),

        $bigImg = $big.children('img');

    var multiple = 2 / 3, n = null,

        maskW = $curImg.width() * multiple,

        maskH = $curImg.height() * multiple,

        bigW = $bigImg.width() * multiple,

        bigH = $bigImg.width() * multiple;

    $mask.css({width: maskW, height: maskH});

    $big.css({width: bigW, height: bigH});

    $small.on({

        mouseenter: function (e) {

            $mask.css('display', 'block');

            $big.css('display', 'block');

            setPos(e);

        },

        mousemove: function (e) {

            setPos(e);

        },

        mouseleave: function () {

            $mask.css('display', 'none');

            $big.css('display', 'none');

        }

    });

    function setPos(e) {

        if (!smallL) {

            smallL = $small.offset().left;

            smallT = $small.offset().top;

            maxL = $small.innerWidth() - maskW;

            maxT = $small.innerHeight() - maskW;

            n = ($bigImg.width() - bigW ) / maxL;

        }

        var curL = e.clientX - smallL - maskW / 2,

            curT = e.clientY - smallT - maskH / 2;

        curL = curL < minL ? minL : (curL > maxL ? maxL : curL);

        curT = curT < minT ? minT : (curT > maxT ? maxT : curT);

        $mask.css({left: curL, top: curT});

        $bigImg.css({left: -curL * n, top: -curT * n})

    }

    function calculatedWidth() {

    }

});

巴特西

JS实现放大镜效果(放大图片)

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