A.Axios请求超时时间设定
B.var instance =axios.create();instance请求超时时间为0
C.var instance =axios.create();instance.defaults.timeout =2500;instance请求超时时间为2.5秒
D.var instance =axios.create();instance.defaults.timeout =2500;instance.get(’/longRequest’,{timeout:5000});instance请求超时时间为5秒