JavaScript实现滑块验证案例

这篇文章主要为大家详细介绍了JavaScript实现滑块验证案例，文中示例代码介绍的非常详细，具有一定的参考价值，感兴趣的小伙伴们可以参考一下
本文实例为大家分享了JavaScript实现滑块验证的具体代码，供大家参考，具体内容如下

<!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>
        * {
            margin: 0;
            padding: 0;
        }
        .box {
            position: relative;
            width: 500px;
            height: 40px;
            border: 1px solid #000;
        }
        p {
            position: relative;
            z-index: 5;
            font: 20px/40px '楷体';
            text-align: center;
            color: rgba(95, 90, 90, 0.479);
        }
        .btn {
            width: 40px;
            height: 40px;
            border: 1px solid #ccc;
            box-sizing: border-box;
            background-color: #fff;
            cursor: pointer;
            z-index: 6;
            position: absolute;
            top: 0;
            left: 0;
            background-position: center;
            background-repeat: no-repeat;
            background-size: 50% auto;
            background-image: url(./图1.png);
        }
        .bg {
            height: 100%;
            position: absolute;
            top: 0;
            left: 0;
            background-color: #7ac23c;
        }
    </style>
</head>
<body>
    <div class="box">
        <div class="btn"></div>
        <p>拖动滑块验证</p>
        <div class="bg"></div>
    </div>
</body>
<script>
    //获取事件
    var box = document.querySelector('.box')
    var p = document.querySelector('p')
    var btn = document.querySelector('.btn')
    var bg = document.querySelector('.bg')
    // 选中文字就会触发这个事件
    this.box.onselectstart = function () {
        return false // 阻止默认行为
    }
    //默认没有验证成功
    var flag = false;
    //按下事件
    btn.onmousedown = function () {
        var e1 = window.event;
        var x1 = e1.offsetX;
        //移动事件
        btn.onmousemove = function () {
            var e2 = window.event;
            var x2 = e2.clientX
            //计算left的值
            var left = x2 - x1
            if (left > 0) {
                //设置滑动块的距离
                this.style.left = left + 'px';
                //设置背景的宽度
                bg.style.width = left + 'px';
                if (left > box.offsetWidth - this.offsetWidth) {
                    //验证成功
                    flag = true;
                    p.innerText = '通过验证'
                    p.style.color = '#000'
                    //事件清除
                    this.onmousedown = null;
                    this.onmousemove = null;
                }
            }
        }
        //鼠标松开
        btn.onmouseup = function () {
            //事件清除
            this.onmousemove = null;
            //判断验证是否成功
            if (flag) {
                return
            }
            this.style.left = 0; //设置滑动块的距离
            bg.style.width = 0; //设置背景的宽度
        };
    }
</script>
</html>

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