html运行实例（event_ondragover_html）-搜寻教程库

代码示例：（标识：event_ondragover_html）
<!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>本例演示如何将 "ondragstart" 和 "ondrag" 事件分配给 p 元素，并将 "ondragover" 和 "ondrop" 事件分配给 div 元素。</p>

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

<div id="droptarget" ondragover="allowDrop(event)" ondrop="drop(event)">
</div>

<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>

<p id="demo"></p>

<script>
function dragStart(event) {
  event.dataTransfer.setData("Text", event.target.id);
}

function dragging(event) {
  document.getElementById("demo").innerHTML = "The p element is being dragged.";
}

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

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>