JavaScript原生代码实现楼层跳跃（js部分有注释）

ゝ一纸荒年。 2022-06-01 06:54 230阅读 0赞

<!doctype html>
    <html lang="en">
    <head>
        <meta charset="UTF-8">
        <meta name="viewport"
              content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
        <meta http-equiv="X-UA-Compatible" content="ie=edge">
        <title>demo</title>
        <style>
            *{
                padding: 0;
                margin: 0;
            }
            body ,html{
                height: 100%;
            }
            ul,ol{
                list-style: none;
            }
            ul{
                height: 100%;
                text-align: center;
                line-height: 50;
            }
            ul li {
                height: 100%;
            }
            ol{
                position: fixed;
                bottom: 100px;
                right: 120px;
            }
            ol  li{
                width: 50px;
                height: 50px;
                border: 1px solid #000;
                line-height: 50px;
                text-align: center;
                margin-top: -1px;
                cursor: pointer;
            }
    
        </style>
        <script>
            window.onload = function () {
                var ul = document.getElementsByTagName("ul")[0];
                var  ol = document.getElementsByTagName("ol")[0];
                var olarr = ol.children;
                var ularr = ul.children;
                var colorArr = ["#fada8d","#03263a","#b3a896","#de7d2c","#14446a"];
                var target = 0;
                var timer = null;
                var leader = 0;
                for (var i = 0;i<olarr.length;i++){
                    ularr[i].style.backgroundColor = colorArr[i];
                    olarr[i].style.backgroundColor = colorArr[i];
    
    
                    // 绑定索引值
                    olarr[i].index = i;
                    // 循环绑定事件
                    olarr[i].onclick = function () {
                        //获取目标位置
                        target = ularr[this.index].offsetTop;
                        // 清除定时器
                        clearInterval(timer);
                    //    设置定时器
                        timer = setInterval(function () {
                            var speed = (target-leader)/10;
                            // 判断方向
                            speed = speed>0?Math.ceil(speed):Math.floor(speed);
                            //下一步到的位置
                            leader = leader+speed;
                            //移动
                            window.scrollTo(0,leader);
                            //判断是否到达，到达清除定时器
                            if(leader == target){
                                console.log(1);
                                clearInterval(timer);
                            }
                        },30)
                    }
                }
                window.onscroll = function () {
                    leader = scroll().top
                }
                //缓动动画封装
                function animate(ele, target) {
                    clearInterval(ele.timer);
                    ele.timer = setInterval(function () {
                        var step = (target - ele.offsetTop) / 10;
                        step = step > 0 ? Math.ceil(step) : Math.floor(step);
                        ele.style.top = ele.offsetTop + step + "px";
                        console.log(1);
                        if (Math.abs(target - ele.offsetTop) < Math.abs(step)) {
                            ele.style.top = target + "px";
                            clearInterval(ele.timer);
                        }
                    }, 25);
                }
                // scroll的封装
                function scroll() {
                    return {
                        "top": window.pageYOffset || document.body.scrollTop || document.documentElement.scrollTop,
                        "left": window.pageXOffset || document.body.scrollLeft || document.documentElement.scrollLeft
                    }
                }
    
    
            }
        </script>
    </head>
    <body>
        <ul>
            <li>Test</li>
            <li>Test</li>
            <li>Test</li>
            <li>Test</li>
            <li>Test</li>
        </ul>
        <ol>
            <li>test</li>
            <li>test</li>
            <li>test</li>
            <li>test</li>
            <li>test</li>
        </ol>
    
    </body>
    </html>