为什么会输出undefined
<script type="text/javascript">
var a=Navigator.appCodeName;
var b=Navigator.appName;
var c=Navigator.appVersion;
var d=Navigator.platform;
var f=Navigator.userAgent;
document.write(a);
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<script type="text/javascript">
var a=Navigator.appCodeName;
var b=Navigator.appName;
var c=Navigator.appVersion;
var d=Navigator.platform;
var f=Navigator.userAgent;
document.write(a);
2015-05-10
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