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HTML ondragover 事件属性
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<!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">把我拖进长方形！</p> <div id="droptarget" ondrop="drop(event)" ondragover="allowDrop(event)"> </div> <p style="clear:both;" id="demo"></p> <script> function dragStart(event) { event.dataTransfer.setData("Text", event.target.id); } function allowDrop(event) { event.preventDefault(); document.getElementById("demo").innerHTML = "p 元素位于 droptarget 之上。"; 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 = "p 元素被删除。"; } </script> </body> </html>