就还是跨域问题了。 OPTIONS
方法响应头不对,少了这些
access-control-allow-origin: *
access-control-allow-methods: *
access-control-allow-headers: DNT,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Range
https://rkonfj-1252785209.cos.ap-guangzhou.myqcloud.com/lln/6.jpg