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本篇文章為大家展示了利用javascript怎么實現一個放大鏡功能，內容簡明扼要并且容易理解，絕對能使你眼前一亮，通過這篇文章的詳細介紹希望你能有所收獲。
涉及技術
偏移量與style.left
需要考慮
代碼實現
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Magnifier Effect</title>
<style>
*{
margin: 0;
padding: 0;
}
#wrap{
width: 400px;
height: 255px;
margin: 50px;
border: 1px solid #ccc;
display: block;
position: relative;
}
#small-box{
position: relative;
z-index: 1;
}
#float-box{
width: 160px;
height: 120px;
position: absolute;
background-color: #ffffcc;
border:1px solid #ccc;
filter: alpha(opacity = 50);
opacity: .5;
display: none;
}
#mask{
position: absolute;
display: block;
width: 400px;
height: 255px;
z-index: 10;
background-color: #ffffff;
filter: alpha(opacity = 0);
opacity: 0;
cursor: move;
}
#big-box{
position: absolute;
top: 0;
left: 460px;
width: 400px;
height: 300px;
overflow: hidden;
border: 1px solid #ccc;
z-index: 1;
display: none;
}
#big-box img{
position: absolute;
z-index: 5;
}
</style>
</head>
<script>
// 頁面加載完畢之后執行
window.onload = function(){
// 獲取父元素wrap, 小盒子,遮罩層, 放大鏡, 大盒子, 大圖片
var wrap = document.getElementById('wrap');
var smallBox = document.getElementById('small-box');
var mask = document.getElementById('mask');
var floatBox = document.getElementById('float-box');
var bigBox = document.getElementById('big-box');
var bigImg = bigBox.getElementsByTagName('img')[0];
console.log(wrap, smallBox, mask, floatBox, bigBox, bigImg);
// 鼠標移動到小盒子上時, 放大鏡顯示, 大盒子顯示
mask.onmouseover = function(){
floatBox.style.display = 'block';
bigBox.style.display = 'block';
}
// 鼠標移出小盒子時, 放大鏡隱藏, 大盒子隱藏
mask.onmouseout = function(){
floatBox.style.display = 'none';
bigBox.style.display = 'none';
}
// 添加鼠標移動事件
mask.onmousemove = function(ev){
// 獲取當前鼠標移動的位置并考慮IE兼容性
var _event = ev || window.event;
// 獲取放大鏡向左移動的距離
var left = _event.clientX - wrap.offsetLeft - smallBox.offsetLeft - floatBox.offsetWidth / 2;
var top = _event.clientY - wrap.offsetTop - smallBox.offsetTop - floatBox.offsetHeight / 2;
// console.log(left, top);
// 考慮邊界情況
if(left < 0){
left = 0;
}else if(left > (mask.offsetWidth - floatBox.offsetWidth)){
left = mask.offsetWidth - floatBox.offsetWidth;
}
if(top < 0){
top = 0;
}else if(top > (mask.offsetHeight - floatBox.offsetHeight)){
top = mask.offsetHeight - floatBox.offsetHeight;
}
floatBox.style.left = left + 'px';
floatBox.style.top = top + 'px';
// calculate percentage
var percentX = left / (mask.offsetWidth - floatBox.offsetWidth);
var percentY = top / (mask.offsetHeight - floatBox.offsetHeight);
// calculate displacement of big image, big image has opposite direction of magnifying glass
bigImg.style.left = -percentX * (bigImg.offsetWidth - bigBox.offsetWidth) + 'px';
bigImg.style.top = -percentY * (bigImg.offsetHeight - bigBox.offsetHeight) + 'px';
}
}
</script>
<body>
<div id="wrap">
<div id="small-box">
<div id="mask"></div>
<div id="float-box"></div>
<img src="./img/macbook-small.jpg" alt="smallMac">
</div>
<div id="big-box">
<img src="./img/macbook-big.jpg" alt="bigMac">
</div>
</div>
</body>
</html>上述內容就是利用javascript怎么實現一個放大鏡功能，你們學到知識或技能了嗎？如果還想學到更多技能或者豐富自己的知識儲備，歡迎關注億速云行業資訊頻道。
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