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<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>e</title>
</head>
<body>
<input type="button" value="按钮" id="inp">
</body>
</html>
<script>
var inp = document.getElementById('inp')
function fun(e) {
console.log('e：' + e)
console.log('typeof e：' + typeof e)
console.log('e.type：' + e.type)
console.log('fun.arguments.length：' + fun.arguments.length)
console.log('e.target：' + e.target)
console.log('e.target.tagName：' + e.target.tagName)
console.log('e.clientX：' + e.clientX) //窗口
console.log('e.clientY：' + e.clientY)
console.log('e.screenX：' + e.screenX) //屏幕
console.log('e.screenY：' + e.screenY)
}
//document.onclick = fun
inp.onclick = fun
</script>
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