ionic angular js 跨域Access-Control-Allow-Origin

 var myUrl = "http://10.1.20.9:8080/bingo-web/system/listWapOutJson.vhtml?wuLiaoID=40010000040";

    $http.get(myUrl).success(function (response) {
      if(response.success){
        console.log("2123");
        $scope.chat = response.data;
      }else {
        console.log("qweqwe");
      }
    })

这样写就会出现以下错误，

XMLHttpRequest cannot load http://10.1.20.9:8080/bingo-web/system/listWapOutJson.vhtml?wuLiaoID=40010000040. No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'http://192.168.40.6:8100' is therefore not allowed access.

求大神，这个问题应该怎么解决呀？

很明显，跨域了嘛。两种解决方法
1：看看ng有没有自己的前台的解决方法，比如ajax的jsonp
2：后台配置允许这个方法跨域

楼上说的对 跨域问题 我感觉如果是平时自己学习，对安全，速度要求不高的话可以试试这个第三方api https://bird.ioliu.cn/

后台接口配置下允许跨域请求就可以

后台在缺省时，是不许可的跨域请求的。百度 cors。以下是spring boot的代码。
import org.springframework.boot.web.servlet.FilterRegistrationBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.Ordered;
import org.springframework.web.cors.CorsConfiguration;
import org.springframework.web.cors.UrlBasedCorsConfigurationSource;
import org.springframework.web.filter.CorsFilter;

@Configuration
public class SecurityCorsConfiguration {

@Bean
public FilterRegistrationBean corsFilter() {
    UrlBasedCorsConfigurationSource source = new UrlBasedCorsConfigurationSource();
    CorsConfiguration config = new CorsConfiguration();
    config.setAllowCredentials(true);
    config.addAllowedOrigin("http://localhost:4200");
    config.addAllowedHeader(CorsConfiguration.ALL);
    config.addAllowedMethod(CorsConfiguration.ALL);
    source.registerCorsConfiguration("/**", config);
    FilterRegistrationBean bean = new FilterRegistrationBean(new CorsFilter(source));
    bean.setOrder(Ordered.HIGHEST_PRECEDENCE);
    return bean;
}

}