public function test(){
    //单个跨域
    header('Access-Control-Allow-Origin:http://www.runoob.com');
    return json(["code"=>1,"name"=>"lhs"]);
}

$origin = isset($_SERVER['HTTP_ORIGIN'])? $_SERVER['HTTP_ORIGIN'] : '';  
  
$allow_origin = array(  
    'http://client1.runoob.com',  
    'http://client2.runoob.com'  
);  
  
if(in_array($origin, $allow_origin)){  
    header('Access-Control-Allow-Origin:'.$origin);       
} 

header('Access-Control-Allow-Origin:*'); 

public function test(){
    return jsonp(["code"=>1,"name"=>"lhs"]);
}

$.ajax({
    type:"get",
    url:"http://tp51hr.com/api/index/test",
    dataType : "JSONP",//必须
    success:function(res){
        console.log(res)
    }
});