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我对使用拖放感到困惑。到目前为止，它可以拖放一个元素。但是，我想在完成放置后存储结构，所以我将放置的目标添加到放置后的父级中，我发现 ondragend 每次调用两次，ondrop 调用基于目标元素的数量. 如何实施？

function drop(){
  //this function is called base on the numbers of target element
  //drop third into first/second will be called once
  //drop second into first and then drop third into second will be called twice
}
function over(){
  //this function is called base on the numbers of total affected element
  //drop third into first/second will be called twice
  //drop second into first and then drop third into second will be called thrice
}
<div ondrop=drop ondragend=over id="first"></div>
<div ondrop=drop ondragend=over id="second"></div>
<div draggable=true id="third"></div>

另外我在 drop 和 over 中都使用 return false 也无法解决问题

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