Antonve

document.getElementById("button540").onclick = myFunction540;

function myFunction540() {
    const phone = document.getElementById("phone540").value;
    if (!phone) {
        alert("заполните phone");
        return false;
    }
    _rc("send", "order", {
        orderMethod: "one-click",
        name: document.getElementById("name540").value,
        phone
    });
}