req.xhr判斷請求來自ajax還是普通請求；

若為ajax則是為true

這個屬性是通過判斷headers中的

x-requested-with的值來判斷的

下面是來自ajax的請求：

1 host: 'localhost:3000',2 connection: 'keep-alive', 3 accept: '*/*', 4 'if-none-match': 'W/"b5-nK3C+n/aPR++6ICHo9ZKmQ"', 5 'user-agent': 'Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/53.0.2785.8 Safari/537.36', 6 'x-requested-with': 'XMLHttpRequest', 7 referer: 'http://localhost:3000/', 8 'accept-encoding': 'gzip, deflate, sdch',9 'accept-language': 'zh-CN,zh;q=0.8', 10 cookie: 'privatecloud_sid=s%3AXUaL1RJr1h2r6yb52djAwrK3TWaIL91V.iuM%2FJ5a0MgnJcBrBPBOqFVShhezZly%2BwxxZ2O2bIa%2Bg'

下面是普通求求：

1 host: 'localhost:3000',2 connection: 'keep-alive', 3 pragma: 'no-cache', 4 'cache-control': 'no-cache', 5 'upgrade-insecure-requests': '1', 6 'user-agent': 'Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/53.0.2785.8 Safari/537.36', 7 accept: 'text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8', 8 'accept-encoding': 'gzip, deflate, sdch',9 'accept-language': 'zh-CN,zh;q=0.8', 10 cookie: 'privatecloud_sid=s%3AXUaL1RJr1h2r6yb52djAwrK3TWaIL91V.iuM%2FJ5a0MgnJcBrBPBOqFVShhezZly%2BwxxZ2O2bIa%2Bg'

以上是通過req.headers打印出來的;

紅色為相同屬性，其他為不同屬性；可以根據這些屬性來做判斷;

轉載于:https://www.cnblogs.com/suoking/p/5773969.html

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