W3School TIY 亲自试一试！

<!DOCTYPE HTML>
<html>
<head>
<style>
#droptarget {
  float: left; 
  width: 200px; 
  height: 35px;
  margin: 55px;
  margin-top: 155px;
  padding: 10px;
  border: 1px solid #aaaaaa;
}
</style>
</head>
<body>

<p ondragstart="dragStart(event)" draggable="true" id="dragtarget">把我拖进矩形！</p>

<p style="clear:both;"><b>注释：</b>Internet Explorer 8 及更早版本或 Safari 5.1 及更早版本不支持 drag 事件。</p>

function allowDrop(event) {
  event.preventDefault();
  document.getElementById("demo").innerHTML = "The p element is OVER the droptarget.";
  event.target.style.border = "4px dotted green";
}

function drop(event) {
  event.preventDefault();
  var data = event.dataTransfer.getData("Text");
  event.target.appendChild(document.getElementById(data));
  document.getElementById("demo").innerHTML = "The p element was dropped.";
}
</script>

</body>
</html>

W3School TIY Editor