在普通网页显示正常，加Https报This request has been blocked; the content must be served over HTTPS.，https网站加载http资源时，http资源被block
解决办法 ：在html头加<meta http-equiv="Content-Security-Policy" content="upgrade-insecure-requests">问题解决
文章来自：https://www.cnblogs.com/zhouguomao/p/11450921.html