<body> <div id="content"> <div id="source"> <div id="touch-source" draggable="true" ondragstart="drag(event)"> <span class="title">景点</span> </div> </div> <div id="target" ondrop="drop(event)" ondragover="allowDrop(event)"> </div> </div> <script> function drag(ev){ ev.dataTransfer.setData("Text",ev.target.id); }; function allowDrop(ev){ ev.preventDefult(); }; function drop(ev){ ev.preventDefault(); var data = ev.dataTransfer.getData("Text"); ev.target.appendChild(document.getElementById(data)); }; </script></body>报错：TypeError: ev.preventDefult is not a function
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