JS movement (left, right and stop)

Disclaimer: This article is a blogger original article, follow the CC 4.0 BY-SA copyright agreement, reproduced, please attach the original source link and this statement.

This link: https://blog.csdn.net/javascript_meng/article/details/100590116

JS sports foundation

Framework of the campaign

At the beginning of the movement, has been shut down timer

And stopping the movement apart (if / else)

Here we use an example to explain:

Example: a circular movement are controlled by the left and right stop button (implemented in code)

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <style>
        .box {
            width: 150px;
            height: 150px;
            background: skyblue;
            position: absolute;
            left: 10px;
            top: 50px;
            border-radius: 50%;
        }
    </style>
</head>

<body>
    <button class="btn-r">向右移动</button>
    <button class="btn-l">向左移动</button>
    <button class="btn-stop">停止</button>
    <div class="box"></div>
    <script>
        var box = document.querySelector('.box');
        var t;

        //向右移动
        document.querySelector('.btn-r').onclick = function () {
            clearInterval(t);//停止正在起作用的定时器
            t = setInterval(moveHor, 20, 10);//将参数放到事件参数之后
        };
        //停止
        document.querySelector('.btn-stop').onclick = function () {
            clearInterval(t);
        };
        //向左移动
        document.querySelector('.btn-l').onclick = function () {
            clearInterval(t);//停止正在起作用的定时器
            t = setInterval(moveHor, 20, -10);
        };

        //水平移动
        function moveHor(speed) {
            var l = window.getComputedStyle(box, null).left;
            l = parseFloat(l); //去掉单位
            box.style.left = l + speed + "px";
        }
    </script>
</body>

</html>

JS movement (left, right and stop)

Guess you like