3 before responding with 4

WordPress responds to the ajax request with readyState 1, 2, 3 before responding with 4
readyState= 1this.status= 0readyState= 2this.status= 200readyState= 3this.status= 200readyState= 4this.status= 20
WordPress responds to the ajax request with readyState 123 before responding with 4
admin4月前
170