非同步承諾連結

如果你有多個非同步任務需要依次發生，則需要將其 promise 物件連結在一起。這是一個簡單的例子：

function First() {
    console.log("Calling Function First");
    return $.get("/ajax/GetFunction/First");
}

function Second() {
    console.log("Calling Function Second");
    return $.get("/ajax/GetFunction/Second");
}
 
function Third() {
    console.log("Calling Function Third");
    return $.get("/ajax/GetFunction/Third");
}

function log(results){
    console.log("Result from previous AJAX call: " + results.data);
}
 
First().done(log)
       .then(Second).done(log)
       .then(Third).done(log);