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<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>本教程(w3big.com)</title> <script src="http://cdn.static.w3big.com/libs/jquery/1.10.2/jquery.min.js"></script> </head> <body> <script> $(function () { function fun( html ){ document.body.innerHTML += "<br>" + html; } fun($.isPlainObject({})); fun($.isPlainObject( "test" )); fun($.isPlainObject(document.location)); //在 IE 8 中返回 true }) </script> </body> </html>