这段代码怎么运行不了？ - 编程论坛

我想用o 遍历obj但为什么不行？
<!doctype html>
<html>
<head>
  <meta charset="utf-8">
  <title>陈炳行的代码！</title>

</head>
<body>
  <script type="text/javascript">
    var obj={user:"chen", age:28, QQ:"297764306", E-Mail:"bingxingc@};
    for(var o in obj){
      document.write("属性："+o+"="+obj[o]+"<br>");
    }
  </script>
</body>
</html>