不想多說(shuō), 一勞永逸吧

@Configuration
public class CORSConfiguration {
    @Bean
    public WebMvcConfigurer corsConfigurer() {
        return new WebMvcConfigurerAdapter() {
            @Override
            public void addCorsMappings(CorsRegistry registry) {
                registry.addMapping("/**")
                        .allowedHeaders("*")
                        .allowedMethods("*")
                        .allowedOrigins("*");
            }
        };
    }
}

var url = "http://112.74.171.99:8080/autoticketapi/pay";                                             
                                       
$.ajax({                                                                                             
    crossDomain : true,                                                                              
    url: url,                                                                                        
    type: "GET",                                                                                     
    data: {"liantuoOrderNo": $(this).attr("liantuoOrderNo"), "orderNo": $(this).attr("orderNo")},    
    dataType: "json",                                                                                
    success: function (data) {                                                                       
        if (data.status != 200) {                                                                    
            alert("自動(dòng)出票錯(cuò)誤,請(qǐng)聯(lián)系技術(shù)")                                                                    
        } else {                                                                                     
            alert(data.msg)                                                                          
        }                                                                                            
    }                                                                                                
});                                                                                                  

https://zhuanlan.zhihu.com/p/32669995