顺序执行代码，并正确返回函数值

Question

问题是函数在执行其中的一段代码之前会返回一个值。在函数的最后，检查变量是否为零，因此首先执行此检查，然后将其递增。如何顺序执行所有操作？

function InSpamBySender(message)
{
    params = {
        "addLabelIds": [
            "SPAM"
        ] 
    };
    let sp, all = 0;
    let current_ms = 0;
    senders = GetSender(message);
    chrome.storage.sync.get(function (data) {
        console.log(data);
        sp = data.spamNum;
        for (i = 0; i < senders.length; i++) {
            for (j in data) {
                if (j === senders[i]) {
                    POST_request("POST", "https://www.googleapis.com/gmail/v1/users/me/messages/" + (message[i].id) + "/modify", false, params);
                    sp++;
                    current_ms++;
                    console.log(current_ms)
                }
            }
        }
        all = data.usedMesNum + senders.length;
        chrome.storage.sync.set({ 'usedMesNum': all }, function () { });
        chrome.storage.sync.set({ 'spamNum': sp }, function () { });
        chrome.runtime.sendMessage("changeStats");
    });
    if (current_ms === 0)
        return false;
    else
        return true;
}