Mixed Content: The page at 'https://xxx.com/xxx' was loaded over HTTPS, but requested an insecure script 'http://xxxxx.com/a.js'. This request has been blocked; the content must be served over HTTPS.
意思就是：混合内容:页面“https://xxx.com/xxx”是通过HTTPS加载的，但请求一个不安全的脚本“http://xxxxx.com/a.js”。该请求已被阻止;内容必须通过HTTPS提供。
原因是：在https中请求http接口或引入http资源都会被直接blocked（阻止），浏览器默认此行为不安全，会拦截。
解决办法：
自动将http的不安全请求升级为https
