jquery Deferred quickly solves the problem of asynchronous callback_jquery

jquery Deferred quickly solves the problem of asynchronous callbacks

function ok(name){

  var dfd = new $.Deferred();
  callback:func(){

     return dfd.resolve( response );
  }

  return dfd.promise();
}

$.when(ok(1),ok(2)).then(function(resp1,resp2){})

//Related APIs are divided into 3 categories

Category 1: $.when(pro1,pro1) merges multiple promise objects into one in the relationship of and

Category 2: promise is triggered to resolve deferred.resolve([ args ] ) deferred.resolveWith( context, [ args ] )

and reject .reject .rejectWith

context context replaces this and notification .notify .notifyWith

Category 3: Response to trigger deferred.done(args) when resolved, deferred.fail() when rejected, deferred.progress()

Regardless of resolution or rejection deferred.always()

deferred.then( doneCallbacks, failCallbacks [, progressCallbacks] )

Promise (or deferred, how to obtain deferred object?)

var dfd = new $.Deferred(); return dfd.promise();

Return the current status of promise

deferred.state() pending (not yet completed) resolved rejected

Pipeline

deferred.pipe( [ doneFilter ], [ failFilter ] ) 


var defer = $.Deferred()

var filtered = defer.pipe( null, function( value ) {

   return value * 3;
});

defer.reject( 6 );
filtered.fail(function( value ) {
   alert( "Value is ( 3*6 = ) 18: " + value );
});

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