Use js to fix the picture at a certain position on the screen!-JS Tutorial-php.cn

Use js to fix the picture at a certain position on the screen!

藏色散人

Release： 2022-08-07 10:47:44

forward

2251 people have browsed it

Use js to get the scroll bar scrolling distance and fix the picture at a certain position on the screen

Idea:
1. Get the distance of the object from the top and left side;
2. Get the element object;
3. Get the distance of the scroll bar when the scroll bar scrolls;
4. Scroll bar The function is executed when scrolling: the distance of the object from the top/left side becomes the original distance from the top/left side by the number of pixels scrolled by the scroll bar.

html code:

<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <title></title>
</head>
<body>
    <div id="left">
        <img src="images/z1.jpg" alt=""/>
    </div>
    <div id="right">
        <img src="images/z2.jpg" alt=""/>
    </div>
</body>
</html>

Copy after login

css code:

*{
            margin: 0;
            padding: 0;
        }
        body{
            width: 2000px;
            height: 2000px;
        }
        .left{
            position: absolute;
            width: 110px;
            height: 110px;
            top: 100px;
            left: 50px;
        }
        .right{
            position: absolute;
            width: 110px;
            height: 110px;
            top: 100px;
            left: 1360px;
        }

Copy after login

js code:

 var leftT;//左侧p距离顶部距离
        var leftL;//左侧p距离左侧距离
        var rightT;//右侧p距离顶部距离
        var rightL;//右侧p距离左侧距离

        var objLeft;//左侧p文档对象
        var objRight;//右侧p文档对象

        function place(){
            objLeft=document.getElementById("left");
            objRight=document.getElementById("right");
            leftT=document.defaultView.getComputedStyle(objLeft,null).top;
            leftL=document.defaultView.getComputedStyle(objLeft,null).left;
            rightT=document.defaultView.getComputedStyle(objRight,null).top;
            rightL=document.defaultView.getComputedStyle(objRight,null).left;

        }
        //获取滚动条滚动的像素数
        function move(){
            var scrollT=document.documentElement.scrollTop;
            var scrollL=document.documentElement.scrollLeft;
            //设置左侧p距离顶部的像素
            objLeft.style.top=parseInt(leftT)+scrollT+"px";
            objLeft.style.left=parseInt(leftL)+scrollL+"px";
            objRight.style.top=parseInt(rightT)+scrollT+"px";
            objRight.style.left=parseInt(rightL)+scrollL+"px";
        }
        window.onload=place;
        window.onscroll=move;

Copy after login

Related recommendations: [JavaScript video tutorial]

The above is the detailed content of Use js to fix the picture at a certain position on the screen!. For more information, please follow other related articles on the PHP Chinese website!