问基于生成器的Javascript协同库支持Chrome浏览器

EN

function delay(ms) {
    var deferred = Q.defer();
    setTimeout(deferred.resolve, ms);
    return deferred.promise;
}

function main()
{
    var callback = Q.async(function*(){
        var bodyStyle = document.body.style;

        yield delay(1000);
        bodyStyle.backgroundColor = "red";
        printOutput("step 1");

        yield delay(1000);
        bodyStyle.backgroundColor = "green";
        printOutput("step 2");

        yield delay(1000);
        bodyStyle.backgroundColor = "blue";
        printOutput("step 3");

        yield delay(1000);
        printOutput("step 4");
        bodyStyle.backgroundColor = "white";
    });

    Q.fcall(callback).then(function (){
        printOutput("Done!");
    });
}