请教ondragexit什么时候出发

如题,以下的代码并没有触发ondragexit,请教h5高手

<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8"/>
    <title></title>
    <style type="text/css">
        div {
            width: 100px;
            height: 100px;
            background: red;
        }
        p {
            border: 1px solid black;
            width: 150px;
            height: 150px;
        }
    </style>
</head>
<body>
<div draggable="true" id="div">
    div
</div>
<p id="target"></p>
<script type="text/javascript">
    var dragged;
    var oDiv = document.getElementById('div')
    var oTarget = document.getElementById('target')
    oDiv.ondragstart = function(e){
        e.dataTransfer.setData('text/plain', 'baidu')
        dragged = e.target
        console.log(dragged, 'dragged')
    }
    oTarget.ondragover = function (e) {
        e.preventDefault()
    }
    oTarget.ondrop = function () {
        oTarget.appendChild(oDiv)
    }
    oDiv.ondragend = function() {
        console.log('dragend')
    }
    oDiv.ondragexit = function () {
        console.log('ondragexit')
    }
    oDiv.ondragleave = function () {
        console.log('ondragleave')
    }
</script>
</body>
</html>
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