手把手教你用js实现一个拖拽效果

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 <div class="list">        <div class="list-item" draggable="true" style="--color:#e63e31">
            <i class="iconfont icon-shuangyuzuo constellation"></i>
            <span class="list-item-title">双鱼座</span>
        </div>
        <div class="list-item" draggable="true" style="--color:#70d265">
            <i class="iconfont icon-shuipingzuo constellation"></i>
            <span class="list-item-title">水平座</span>
        </div>
        <div class="list-item" draggable="true" style="--color:#f0e941">
            <i class="iconfont icon-mojiezuo constellation"></i>
            <span class="list-item-title">摩羯座</span>
        </div>
        <div class="list-item" draggable="true" style="--color:#da8218">
            <i class="iconfont icon-chunvzuo constellation"></i>
            <span class="list-item-title">处女座</span>
        </div>
        <div class="list-item" draggable="true" style="--color:#7ff0ec">
            <i class="iconfont icon-shizizuo constellation"></i>
            <span class="list-item-title">狮子座</span>
        </div>
    </div>复制代码

body{
  background-color: #000;
}
.list{  width: 300px;  height: 360px;  
  margin: 100px auto 0;  display: flex;
  flex-direction: column;
  justify-content: space-around;
}
.list-item{  width: 100%;  display: flex;
  align-items: center;  padding: 0 16px;
  border-radius: 10px;  background-color: var(--color);
}
.constellation{
  line-height: 2.5em;
  font-size: 20px;  color: #fff;
}
.list-item-img{  width: 30px;  height: 30px;
}
.list-item-title{
  margin-left: 20px;  color: #fff;
}// 移动动画class.list-item.moving{
background-color: transparent;border: 2px dashed #ccc;
}复制代码

// 获取整个listconst list = document.querySelector('.list')// 获取每一个盒子const item = document.querySelectorAll('.list-item')复制代码

// 开始拖动
    list.ondragstart = e => {
        source_node = e.target
        recode(item)        setTimeout(() => {        // 拖拽时样式
            e.target.classList.add('moving')
        }, 0)        // 设置拖动效果
        e.dataTransfer.effectAllowed = 'move'
    }复制代码

 // 拖拽放入有效目标触发
    list.ondragenter = e => {
        e.preventDefault()        console.log(e.target.id, list)        if (e.target === list || e.target === source_node) {            return false
        }        const childer = Array.from(list.children)        const sourceIndex = childer.indexOf(source_node)        const targetIndex = childer.indexOf(e.target)        // console.log(sourceIndex, targetIndex)
        if (sourceIndex < targetIndex) {            // 从下往上拖动
            list.insertBefore(source_node, e.target.nextElementSibling)
        } else {            // 从上往下拖动
                list.insertBefore(source_node, e.target)
        }        // 动画效果函数
        last([e.target, source_node])
    }复制代码

// 拖放结束
    list.ondragend = e => {
        e.target.classList.remove('moving')
    }复制代码