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HTML

CSS

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JavaScript

Babel includes JSX processing.

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HTML

              
                <div class="g-wrap">
    <div class="g-container bg"></div>
    <div class="g-container clip">
        <div class="move" style="position:absolute; width:100px; height:100px; background:gray"></div>
    </div>
    <div class="g-container bg2"></div>
</div>

              
            
!

CSS

              
                html, body {
    width: 100%;
    height: 100%;
    display: flex;
}

.g-wrap {
    width: 100vw;
    height: 200px;
    margin: auto;
    background: #fff;
    display: flex;
    justify-content: space-around;
}

.g-container {
    width: 200px;
    height: 200px;
    margin: auto;
    background: #fc0;
    clip-path: polygon(-1000% 0, 1000% 0, 1000% 100%, -1000% 100%);
}

// .clip {
//     &::before {
//         content: "";
//         position: absolute;
//         top: 0;
//         bottom: 0;
//         right: -250%;
//         left: -250%;
//         border: 1px dashed #666;
//     }
// }

.bg,bg2 {
    margin-top: -40px;
    background: #0f699e;
}
.bg2 {
    background: #0f699e;
    margin-top: 40px;
}
              
            
!

JS

              
                var moveElem = document.querySelector('.move'); //待拖拽元素      

var dragging; //是否激活拖拽状态
var tLeft, tTop; //鼠标按下时相对于选中元素的位移

//监听鼠标按下事件
document.addEventListener('mousedown', function(e) {
    if (e.target == moveElem) {
        
        dragging = true; //激活拖拽状态
       var moveElemRect = moveElem.getBoundingClientRect();
        tLeft = e.clientX - moveElemRect.left; //鼠标按下时和选中元素的坐标偏移:x坐标
        tTop = e.clientY - moveElemRect.top; //鼠标按下时和选中元素的坐标偏移:y坐标
    }
});

//监听鼠标放开事件
document.addEventListener('mouseup', function(e) {
    dragging = false;
});

//监听鼠标移动事件
document.addEventListener('mousemove', function(e) {
    if (dragging) {
        var moveX = e.clientX - tLeft, 
              moveY = e.clientY - tTop;

        moveElem.style.left = moveX + 'px';
        moveElem.style.top = moveY + 'px';
      
    }
});
              
            
!
999px

Console