这里有答案&＃xff0c;但还是不能理解为什么constructor不能判断数组&＃xff0c;后面谷歌了一下终于找到了。
http://blog.csdn.net/lee_magnum/article/details/11555981
答案:
DOCTYPE html>
<html lang&＃61;"en">
<head><meta charset&＃61;"UTF-8"><title>Documenttitle>head>
<body><iframe id&＃61;"fr1">iframe><script>window.onload &＃61; function () {var iframe &＃61; document.getElementById(&＃39;fr1&＃39;);var iwindow &＃61; iframe.contentWindow;var idoc &＃61; iwindow.document;//获取iframe里面的数组var xArray &＃61; iwindow.Array;//当去当前页面的数组var arr &＃61; [];console.log(xArray.constructor &＃61;&＃61; Array);//false
console.log(arr.constructor &＃61;&＃61; Array);//true
}script>
body>
html>
参考资料&＃xff1a;
http://blog.csdn.net/lee_magnum/article/details/11555981
https://segmentfault.com/a/1190000004502619
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