JavaScript写放大镜效果
2022/4/18 22:13:02
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<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Document</title> <style type="text/css"> #middle { width: 400px; height: 400px; position: absolute; top : 50px; left : 100px; border: 1px solid; } #middle img { width: 400px; height: 400px; } #len { width: 200px; height: 200px; background: #f00; position: absolute; top: 0; left: 0; opacity: 0.5; display: none; } #big { width: 400px; height: 400px; position: absolute; top : 50px; left : 520px; border:1px solid; overflow: hidden; display: none; } #big img { width: 800px; height: 800px; position: absolute; top : 0; left : 0; } </style> </head> <body> <div id="middle"> <img src="images/middle.jpg"> <div id="len"></div> </div> <div id="big"> <img src="images/big.jpg" id="big_img"> </div> <script src="js/tools.js"></script> <script> /* 鼠标移入/移出 div#middle */ $("#middle").onmouseenter = function(){ $("#len").style.display = "block"; $("#big").style.display = "block"; } $("#middle").onmouseleave = function(){ $("#len").style.display = "none"; $("#big").style.display = "none"; } // 求 div#middle 元素在文档中定位 var middleOffset = offset($("#middle")); /* 鼠标在 div#middle 上移动 */ $("#middle").onmousemove = function(e){ // 镜头坐标 var _top = e.pageY - middleOffset.top - 100, _left = e.pageX - middleOffset.left - 100; // 判断镜头是否在div#middle中图范围内移动 if (_top < 0) _top = 0; else if (_top > 200) _top = 200; if (_left < 0) _left = 0; else if (_left > 200) _left = 200;
更多内容请见原文,文章转载自:https://blog.csdn.net/weixin_44519496/article/details/118599333
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