$.ajax asynchronous request format example

    $.ajax({
        type: "POST",
        url: "index.php?m=face_certification&a=face_cert_url",
        data: {
            "metainfo":metainfo,
            "name":name,
            "idcard":idcard
        },
        dataType: "json",
        contentType: "application/json; charset=utf-8",
        success: function (res) {
            console.log(res);
        },
         error: function (res){
            console.log(res);
        },
        complete:function(res){
            console.log(res);
        }
    });