前端JS電商放大鏡效果，供大家參考，具體內容如下
<!DOCTYPE html><html lang="en"><head> <meta charset="UTF-8"> <title>26-電商放大鏡</title> <style type="text/css"> *{ padding: 0; margin: 0; } #left{ padding: 0; margin: 0; width: 400px; height: 400px; border: 2px solid blue; background: url(http://chuantu.biz/t6/17/1503469475x2063891122.jpg) no-repeat; float: left; cursor: crosshair; position: relative; box-sizing: border-box; } #box{ width: 200px; height: 200px; background: white; opacity: 0.6; position: absolute; top: 0; left: 0; display: none; box-sizing: border-box; } #cover{ width: 400px; height: 400px; background: red; position: absolute; left: 0; top: 0; opacity: 0; box-sizing: border-box; } #right{ width: 400px; height: 400px; border: 2px solid black; overflow: hidden; position: relative; display: none; box-sizing: border-box; } #rpic{ position: absolute; } </style> <script type="text/javascript"> window.onload = function(){ var left = document.getElementById("left"); var right = document.getElementById("right"); var rpic = document.getElementById("rpic"); var box = document.getElementById("box"); var cover = document.getElementById("cover"); // 給左側加鼠標移動事件 cover.onmousemove = function(){ //獲得事件對象 var ev = window.event; var mouse_left = ev.offsetX || ev.layerX; var mouse_top = ev.offsetY || ev.layerY; // document.title = mouse_left + '|' + mouse_top; //計算色塊的位置 var box_left = mouse_left - 100; var box_top = mouse_top - 100; // 判斷是否超出 if (box_left < 0) { box_left = 0; } if (box_left > 200) { box_left = 200; } if (box_top < 0) { box_top = 0; } if (box_top > 200) { box_top = 200; } // 讓色塊移動 box.style.left = box_left + 'px'; box.style.top = box_top + 'px'; //計算右側圖片位置 var rpic_left = box_left*-2; var rpic_top = box_top*-2; // 讓右側移動 rpic.style.left = rpic_left + 'px'; rpic.style.top = rpic_top + 'px'; } //給左側加鼠標移入事件 cover.onmouseover = function(){ // 讓左側色塊和右側隱藏 box.style.display = 'block'; right.style.display = 'block'; } // 給左側加鼠標移出事件 cover.onmouseout = function(){ // 讓左側色塊和右側隱藏 box.style.display = 'none'; right.style.display = 'none'; } } </script></head><body> <div id="left"> <div id="box"></div> <div id="cover"></div> </div> <div id="right"> <img src="http://chuantu.biz/t6/17/1503469419x2063891122.jpg" id="rpic"> </div></body></html>以上就是本文的全部內容，希望對大家的學習有所幫助，也希望大家多多支持武林網。
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