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onclick自带event事件，代码如下：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
</head>
<body>
<button onclick="btnFunc()"></button>
<script>
function btnFunc()
{
var e = window.event || arguments.callee.caller.arguments[0];
console.log(e);
}
</script>
</body>
</html>