PromiseChain.js

/* 以他的例子來說，*/
getThingFromHardDrive(function(thing) {
  uploadToServer(thing, function(response) {
    saveToLogDatabase(response, function(logResponse) {
      getAnotherThingFromHardDrive(function(thing) {
        // etc
      })
    })
  })
})
/* 可以串成 */

(function(){
  var promise = new Promise();
    getThingFromHardDrive(function(thing) {
       promise.resolve(thing);
  })
promise.then(function(thing){
  var nextpromise = new Promise();
  uploadToServer(thing, function(response) {
      nextpromise.resolve(response);
  });
    return nextpromise;
}).then(function(response){
  var nextpromise = new Promise();
    saveToLogDatabase(response, function(logResponse) {
        nextpromise.resolve(logResponse);
    })
  return nextpromise;
}).then(function(logResponse){
  var nextpromise = new Promise();
  getThingFromHardDrive(function(thing) {
     nextpromise.resolve(thing);
  });
    return nextpromise;
});;