JavaScript图片左右拖拽对比

let slider = new sliderBeforeAfter({
    class_name: 'slider',
    src: 'before.jpg',
    src2: 'after.jpg'
});

let slider = new sliderBeforeAfter({
    class_name: 'slider',
    width: '500px',
    height: '4000px'
});

let slider = new sliderBeforeAfter({
    class_name: 'slider',
    border_width: '2px',
    border_color: '#fff'
});