1.使用children获取字标签组
2.求当前鼠标坐标
3.碰撞检测
4.大小盒子通过比例同步
运行效果
代码
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Title</title> <style> * { margin: 0; padding: 0; list-style: none; border: none; } #box { width: 350px; height: 350px; margin: 100px 0 0 100px; position: relative; } #box > #small_box { height: 100%; width: 100%; border: 1px solid #cccccc; box-sizing: border-box; position: relative; } #box > #small_box > img { height: 100%; width: 100%; } #box > #small_box > #mask { width: 100px; height: 100px; background-color: rgba(255, 255, 0, .4); position: absolute; left: 0; top: 0; cursor: move; /*隐藏*/ display: none; } #box > #big_box { height: 600px; width: 600px; border: 1px solid #cccccc; position: absolute; left: 360px; top: 0; overflow: hidden; display: none; } #box > #big_box > img{ position: absolute; left: 0; top: 0; } #list { margin: 20px 0 0 100px; } #list ul li { float: left; margin: 5px; cursor: pointer; } </style> </head> <body> <div> <div> <img src="https://www.jb51.net/images/pic001.jpg" alt=""> <span></span> </div> <div> <img src="https://www.jb51.net/images/pic01.jpg" alt=""> </div> </div> <div> <ul> <li><img src="https://www.jb51.net/images/pic0001.jpg" alt=""></li> <li><img src="https://www.jb51.net/images/pic0002.jpg" alt=""></li> <li><img src="https://www.jb51.net/images/pic0003.jpg" alt=""></li> <li><img src="https://www.jb51.net/images/pic0004.jpg" alt=""></li> </ul> </div> <script src=""></script> <script> window.addEventListener('load', function (ev) { // 1. 获取标签 var box = myTools.$('box'), s_box = box.children[0], b_box = box.children[1], mask = s_box.children[1]; var list_Lis = myTools.$('list').getElementsByTagName('li'); b_img = b_box.children[0]; // 2. 监听鼠标进入小盒子 s_box.addEventListener('mouseover', function (evt) { // 2.1 显示隐藏内容 mask.style.display = 'block'; b_box.style.display = 'block'; // 2.2 监听鼠标移动 s_box.addEventListener('mousemove', function (evt1) { var e = evt1 || window.event; // 2.3 求出鼠标坐标 var pointX = e.pageX - box.offsetLeft - mask.offsetWidth * 0.5; var pointY = e.pageY - box.offsetTop - mask.offsetHeight * 0.5; // 2.4 边界碰撞检测 if (pointX < 0) { pointX = 0 } else if (pointX >= s_box.offsetWidth - mask.offsetWidth - 2) { pointX = s_box.offsetWidth - mask.offsetWidth - 2; } if (pointY < 0) { pointY = 0 } else if (pointY >= s_box.offsetHeight - mask.offsetHeight - 2) { pointY = s_box.offsetHeight - mask.offsetHeight - 2; } // 2.5 让放大镜走起来 mask.style.left = pointX + 'px'; mask.style.top = pointY + 'px'; // 2.6 让大盒子中图片走起来 /* * smallX / bigX = sBox.width / bBox.width * bixX = smallX/(sBox.width / bBox.width) * */ b_img.style.left = -pointX / (s_box.offsetWidth/b_box.offsetWidth) + 'px'; b_img.style.top = -pointY / (s_box.offsetHeight/b_box.offsetHeight) + 'px'; }) }); // 3. 监听鼠标离开小盒子 s_box.addEventListener('mouseout', function (evt) { // 2.1 隐藏内容 mask.style.display = 'none'; b_box.style.display = 'none'; }); // 4. 监听鼠标点击li标签 for (var i = 0; i < list_Lis.length; i++) { (function (i) { var li = list_Lis[i]; li.addEventListener('mouseover',function (ev1) { s_box.children[0].src = 'images/pic0'+(i+1)+'.jpg'; b_img.src = 'images/pic0'+(i+1)+'.jpg'; }); })(i); } }); </script> </body> </html>