W3Schools Tryit 编辑器 - W3Schools 中文教程

<!DOCTYPE HTML>
<html>
<style>
.droptarget {
  width: 100px; 
  height: 35px;
  padding: 10px;
  border: 1px solid black;
}
</style>

<body>
<h1>HTML DOM Events</h1>
<h2>The ondrag Event</h2>

<p>Use the HTML DOM to assign "ondragstart", "ondrag", "ondragover" and "ondrop" events to the document object.</p>

<p>Drag the text up and down between the two rectangles:</p>

document.ondrag = function(event) {
  document.getElementById("demo").innerHTML = "The text is being dragged";
};

/* Events fired on the drop target */
document.ondragover = function(event) {
  event.preventDefault();
};

document.ondrop = function(event) {
  event.preventDefault();
  if ( event.target.className == "droptarget" ) {
    const data = event.dataTransfer.getData("Text");
    event.target.appendChild(document.getElementById(data));
    document.getElementById("demo").innerHTML = "The text was dropped";
  }
};
</script>

</body>
</html>