<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Document</title>
<style>
#box{
width:300px;
height:180px;
border:1px solid #000;
}
#img1{
width:200px;
height:120px;
margin: 20px;
}
</style>
</head>
<body>
<div id="box"></div>
<img src="img/6.jpg" id="img1" draggable="true">
<script>
window.onload=function(){
var box=document.getElementById('box'),
img1=document.getElementById('img1');
img1.ondragstart=drag(event);
box.ondragover=allowdrop(event);
box.ondrop=drop(event);
function allowdrop(ev){
ev.preventDefault();
}
function drag(ev){
ev.dataTransfer.setData("Text",ev.target.id);
}
function drop(ev){
ev.preventDefault();
var data=ev.dataTransfer.getData("Text");
ev.target.appendChild(document.getElementById(data));
}
}
</script>
</body>
</html>当我把ondragstart ondragover ondrop事件放在HTML元素标签内时，代码正常运行，但是像上边放在<script>中时，就会出现错误Uncaught TypeError: Cannot read property 'setData' of undefined 请问各位大神是哪里出了问题，怎么修改？
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