跟随鼠标移动透明 div - 如何使页面背景变暗但不使 div 内部变暗？
[英]Moving transparent div that follows mouse - how can I darken the background of a page but not darken the inside of the div?
问题描述
我有一个我自己创建的“辅助工具栏”——类似于 UserWay，但任何人都可以免费使用。
我正在尝试创建一个“可读性栏”，将 100% 宽度的 div 添加到页面并使用用户鼠标移动。 本质上，这允许用户更轻松地关注和阅读页面的特定区域。 我有这个运作良好。 但是，我想使 div 外部的页面变暗，而不是使 div 的内部变暗。 类似于在页面上扔一个透明的变暗层，但在这个可读性栏的内部完全删除它 - 它会不断地在页面上上下移动以跟随光标。
关于如何解决这个问题的任何想法？
let readabilityDiv = document.getElementById('readability'); let body = document.querySelector('body'); function isTouchDevice(){ try{ document.createEvent("TouchEvent"); return true; } catch(e){ return false; } } const move = (e) =>{ //Try, catch to avoid errors for touch screens - Error thrown when user doesn't move their finger try{ //PageX and PageY return the position of clients cursor from top left of screen var y = !isTouchDevice() ? e.pageY: e.touches[0].pageY; } catch(e){} //set let and top based on mouse pointer readabilityDiv.style.top = y -50 + "px"; } //for mouse document.addEventListener("mousemove", (e) => { move(e); }); //forTouch document.addEventListener("touchmove", (e) => { move(e); })
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>Document</title> <style> html{ font-size: 10px; } body{ padding: 10px; margin: 0; background: white; font-size:1.6rem; box-shadow: inset 1px 1px 1px #ccc; } #readability{ width: 100%; height: 9.6rem; position: absolute; left: 0; border-top: 5px solid #000; border-bottom: 5px solid #000; } </style> </head> <body> <div id="readability"></div> <h1>Welcome to my page</h1> <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Earum tempore maxime officia nobis debitis, dolorum consectetur ducimus temporibus repellendus voluptates quaerat praesentium, amet aperiam quis a ea, facere eum dignissimos id numquam consequatur non excepturi molestiae. Nisi temporibus, quia, tenetur cumque nulla corrupti, autem nesciunt fugiat veritatis voluptate mollitia nostrum.</p> <p>Lorem ipsum, dolor sit amet consectetur adipisicing elit. Necessitatibus natus possimus ex tempore? Iste pariatur fuga officia dolorum soluta, ratione temporibus assumenda distinctio, nostrum voluptates mollitia, quo modi fugiat nihil veniam ullam ipsam suscipit voluptatem accusamus incidunt deleniti aperiam commodi reiciendis. Laboriosam quis, repellendus ducimus vero consequatur cupiditate eius quae excepturi reprehenderit cum obcaecati? Iste dolor, voluptas libero laborum dolores magni ex voluptatum aliquam, sequi, atque asperiores iure iusto enim facilis optio nemo quos? Corrupti iste necessitatibus autem eaque commodi? Cumque sed numquam assumenda iste. Corporis optio, modi aut a cumque ullam quo repellendus vero provident adipisci similique aperiam qui.</p> <script src="script.js" type="text/javascript"></script> </body> </html>
1 个解决方案
解决方案1
2 已采纳 2022-07-18 12:45:43
有很多方法可以做到这一点。 一种方法是使用散布较大的盒子阴影。
let cursor = document.getElementById('cursor'); const onMouseMove = (e) =>{ cursor.style.left = e.pageX - 50 + 'px'; cursor.style.top = e.pageY - 50 + 'px'; } document.addEventListener('mousemove', onMouseMove);
#cursor { position: fixed; width: 100px; height: 100px; border-radius: 100%; box-shadow: 0 0 0 200vw rgba(0,0,0,0.6); left: 0; top: 0; pointer-events: none; }
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如何使 div 弹出窗口后面的背景变暗？
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