BLUEBIRD-API Introduction and Demo

varPromise = require ("Bluebird");varFS = require ("FS");//Method of PromisevarReadfileasync =promise.promisify (fs.readfile);//. Spread ([function Fulfilledhandler] [, function Rejectedhandler]), Promise//usage: Splitting the result set//ExamplePromise.delay (0). Then (function () {    return[Readfileasync (' 1.txt ', ' utf-8 '), Readfileasync (' 2.txt ', ' utf-8 '), Readfileasync (' 3.txt ', ' utf-8 ')    ];}). Spread (function(File1, File2, File3) {console.log (file1);    Console.log (file2); Console.log (FILE3);})//. Finally (Function handler), Promise//similar to try: Catch.. Finally in the role of finally//ExamplePromise.delay (0). Then (function () {    return[Readfileasync (' 1.txt ', ' utf-8 '), Readfileasync (' 2.txt ', ' utf-8 '), Readfileasync (' 4.txt ', ' utf-8 ')    ];}). Spread (function(File1, File2, File3) {console.log (file1);    Console.log (file2); Console.log (FILE3);}).Catch(function(e) {console.log (e);}).finally(function () {    //The final error is still executed in the end;Console.log (4)})//Promise.join (promise| Thenable|value promises, Function handler)-Promise//join a few promise functions and use a bit like spread//ExamplevarJoin =Promise.join;join (Readfileasync (' 1.txt ', ' utf-8 '), Readfileasync (' 2.txt ', ' utf-8 '), Readfileasync (' 3.txt ', ' utf-8 '),function(File1, File2, file3) {returnparseint (file1) + parseint (file2) +parseint (FILE3); }). Then (function(content) {Console.log ("Sum result:" +content); })//Synchronous inspection Synchronous Detection//ExamplevarRf1 = Readfileasync (' 1.txt ', ' utf-8 ');varRf2 = Readfileasync (' 2.txt ', ' utf-8 ');varRf3 = Readfileasync (' 3.txt ', ' utf-8 ');varJoin =Promise.join;join (Rf1, Rf2, Rf3,function(File1, File2, file3) {returnparseint (file1) + parseint (file2) +parseint (FILE3);}). Then (function(content) {Console.log ("Sum result:" +content);}).finally(function () {    //. Isfulfilled (), Boolean    //detection is completeConsole.log ("Success:" +rf1.isfulfilled ()); //. isrejected (), Boolean    //Detect if FailureConsole.log ("Fail:" +rf1.isrejected ()); //. Ispending (), Boolean    //detect if in progressConsole.log ("Pending:" +rf1.isrejected ()); //. Value (), dynamic    //The result of success, the general use of the first to determine whether to complete    if(rf1.isfulfilled ()) {Console.log (Rf1.value ()); }    //. Reason (), dynamic    //the reason for failure, the same as the use of the first to determine whether failure    if(rf1.isrejected ()) {Console.log (Rf1.reason ()); }})//. All (), Promise//The parameter is an array, and the inside is promise, and all the successful returns are also the arrays//ExamplevarRFALL1 = Readfileasync (' 1.txt ', ' utf-8 ');varRfAll2 = Readfileasync (' 2.txt ', ' utf-8 ');varRfAll3 = Readfileasync (' 3.txt ', ' utf-8 ');varFiles =[RfAll1, RfAll2, RfAll3]; Promise.all (Files). Then (function(s) {Console.log ("All:" +s)});//. Props (), Promise//similar to. All (), but the parameter is object, all successful return values are also object//ExamplePromise.props ({rfprop1:readfileasync (' 1.txt ', ' utf-8 '), Rfprop2:readfileasync (' 2.txt ', ' utf-8 '), Rfprop3:readfileasync (' 3.txt ', ' utf-8 ')}). Then (function(content) {Console.log (json.stringify (content));})//. Settle (), Promise//basically equivalent to. all ();//ExamplevarRfsettle1 = Readfileasync (' 1.txt ', ' utf-8 ');varRfsettle2 = Readfileasync (' 2.txt ', ' utf-8 ');varRfsettle3 = Readfileasync (' 3.txt ', ' utf-8 ');varFiles =[Rfsettle1, Rfsettle2, Rfsettle3]; Promise.all (Files). Then (function(s) {Console.log ("Settle:" +s)});//. Some (int count), Promise//The first parameter is an array, the second is a number, and the return value is the first to return a successful value//Examplevarrfsome1 = Readfileasync (' 1.txt ', ' utf-8 ');varrfsome2 = Readfileasync (' 2.txt ', ' utf-8 ');varRfsome3 = Readfileasync (' 3.txt ', ' utf-8 ');varFiles =[Rfsome1, Rfsome2, Rfsome3]; Promise.some (Files,2). Spread (function(First,second) {Console.log ("Some:" +First ); Console.log ("Some:" +second);})//. Map (Function mapper [, Object options]), Promise//The parameter is an array and does not need to be promise, as long as the function inside the map is promise. A sort of map method similar to array//ExamplevarFiles = [' 1.txt ', ' 2.txt ', ' 3.txt ']; Promise.map (Files,function(file) {returnReadfileasync (file, ' Utf-8 ');}). Then (function(content) {Console.log ("Map:" +content);})//. Reduce (Function reducer [, Dynamic InitialValue]), Promise//The concept is somewhat like an array of reduce methods. Total is the returned assembly value, and filename is item,0 as the initial value//ExamplePromise.reduce (["1.txt", "2.txt", "3.txt"],function(Total, fileName) {returnReadfileasync (FileName, "UTF8"). Then (function(contents) {returnTotal + parseint (contents, 10); });}, 0). Then (function(total) {Console.log ("Reduce:" +Total )});

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BLUEBIRD-API Introduction and Demo