在每个then回调中，您都需要 返回 新的Promise：
exports.viewFile = function(req, res) {
var fileId = req.params.id;
@R_903_2419@ContentRequest('files/' + fileId + '/content', req.user.@R_903_2419@.accessToken)
.then(function(response) {
return @R_903_2419@ViewerRequest('documents', {url: response.request.href}, 'POST');
})
.then(function(response) {
return @R_903_2419@ViewerRequest('sessions', {document_id: response.body.id}, 'POST');
})
.then(function(response) {
console.log(response);
});
};
.then()调用返回的承诺然后将使用“内部”承诺中的值进行解析，以便您可以轻松地链接它们。
通用模式：
somePromise.then(function(r1) {
return nextPromise.then(function(r2) {
return anyValue;
});
}) // resolves with anyValue
||
\||/
\/
somePromise.then(function(r1) {
return nextPromise;
}).then(function(r2) {
return anyValue;
}) // resolves with anyValue as well
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