js implements sliding slider verification (with code)

html:



    
    
    



    

        

            
            

            

        
        

            
            拖动滑块
        
    

css:
.box {
    width: 300px;
    background-color: palevioletred;
    padding: 20px;
    background-color: #fff;
    box-shadow: 2px 2px 8px 0 rgba(0, 0, 0, 0.4);
}

.imgBox img {
    width: 100%;
}

.imgBox {
    position: relative;
    width: 300px;
    overflow: hidden;
    box-shadow: 0 0 8px 0 rgba(0, 0, 0, 0.4);
}

.verify {
    position: absolute;
    left: 10px;
    width: 38px;
    height: 38px;
    top: 50%;
    border-radius: 5px;
    background-repeat: no-repeat;
    background-attachment: scroll;
    background-size: 300px;
    box-shadow: 0 0 10px 0 rgba(0, 0, 0, 0.4), 0 0 10px 0 rgba(90, 90, 90, 0.4);
    z-index: 1;
}

.verified {
    position: absolute;
    width: 38px;
    height: 38px;
    top: 50%;
    right: 10px;
    border-radius: 5px;
    background-color: rgba(0, 0, 0, 0.1);
    box-shadow: 0 0 10px 0 rgba(0, 0, 0, 0.4) inset;
}

.handle {
    display: flex;
    align-items: center;
    position: relative;
    height: 30px;
    border-radius: 20px;
    margin: 20px 0;
    padding: 4px 0 4px 70px;
    box-shadow: 0 0 20px 0 rgba(0, 0, 0, 0.2) inset;
    background: #f5f5f5;
    user-select: none;
}

.swiper {
    position: absolute;
    top: -7px;
    left: 0px;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background-color: pink;
    box-shadow: 2px 2px 6px 0 rgba(0, 0, 0, 0.2);
    z-index: 2;
}



.text {
    color: #aaa;
    position: relative;
    z-index: 1;
    width: 100%;
    border-radius: 8px;
    padding-left: 20px;
    margin-left: -30px;
    background: -webkit-gradient(linear, left top, right top, color-stop(0, #f1f1f1),  color-stop(1, #f5f5f5));
    transition: opacity 0.5s ease-in-out;
    -webkit-animation: slidetounlock 2s infinite;
}
@keyframes slidetounlock {
    0% {
        background-position: -100px 0
    }
    50%{
        background-position: 0px 0
    }
    100% {
        background-position: 100px 0
    }
}

js:
var box = $('.box'),
    imgBox = $('.imgBox'),
    handle = $('.handle')
swiper = $('.swiper'),
    text = $('.text'),
    verify = $('.verify'),
    verified = $('.verified')

$(function () {
    // 随机添加背景图
    refreshImg()

    window.onload = start()
})


function start() {
    var verImg = $('.verImg')[0];

    if (verImg) {
        verImg.onload = function () {
            //获取图片的高度
            var imgH = this.clientHeight;

            //随机生成坐标（图片框固定宽度为300px 高度不定）
            var verX = 150 * (1 + Math.random()) - 38,
                verY = imgH / 4 + Math.random() * imgH / 2;
            //用户滑动函数
            fnDown(verX, verY);

        }
    }
}

function fnDown(verX, verY) {
    swiper.mousedown(function () {
        e=event || window.event
        e.stopPropagation()//阻止冒泡行为（让子元素与父元素的响应分离）

        //30为模块的宽度
        verify.css({
            display: 'block',
            top: `${verY}px`,
            'background-position': `-${verX}px -${verY}px`
        })
        verified.css({display: 'block', left: `${verX}px`, top: `${verY}px`})

        // 获取鼠标到按钮的距离
        var disX = e.clientX - $(this).offset().left,
            disY = e.clientY - $(this).offset().top;
        text.css('opacity', '0');

        //防止重复绑定多次触发
        box.unbind('mousemove');
        box.unbind('mouseup');

        //移动
        box.bind('mousemove', function () {
            e = event || window.event;
            fnMove(e, disX, disY);
        })

        //释放
        box.bind('mouseup', function () {
            var stopL = verify.offset().left - 28;

            //误差在2px以内则算验证成功
            if (Math.abs(stopL - verX) > 2) {
                alert('验证失败');
            } else {
                alert('验证成功');
            }
            //解除绑定，并将滑块模块归位
            box.unbind('mousemove');
            swiper.css('left', '0px');
            verify.css('left', '10px');
            text.css('opacity', '1')
            box.unbind('mouseup');
        })
    })
}

function fnMove(e, posX, posY) {
    // 这里的e是以鼠标为参考
    var l = e.clientX - posX - $(handle).offset().left,
        winW = $(handle).width() + 29
    // 限制拖动范围只能在handle中
    if (l < 0) {
        l = 0
    } else if (l > winW) {
        l = winW
    }

    swiper.css('left', `${l}px`)
    verify.css('left', `${l + 10}px`)
}

function refreshImg() {

    verify.hide()
    verified.hide()

    var verImg = $('.verImg')
    if (verImg.length) {
        verImg.attr('src', `image/1.png`)
    } else {
        imgBox.prepend(``)
    }
    verify.css('background-image', `url('image/1.png')`)
}