at first I used vue axios, "application/x-www-form-urlencoded; charset=UTF-8" server to return Access-Control-Allow-Origin:* but send% past 
unable to decode value
ajax "Content-Type": "application/json; charset=UTF-8"
Access-Control-Allow-Origin:*
vue axios "Content-Type": "application/json; charset=UTF-8" Access-Control-Allow-Origin:* ;
java tomcat
][3]][2]
did not get the data
you have a cross-domain problem with application/json because the server has not configured the cross-domain to handle option requests. Let your backend configure
how the axios request header is set. Send out the code to see
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