deferred.catch()

所属分类：延迟对象 英文文档：deferred.catch()

deferred.catch( failFilter )Returns: Promise

Description: Add handlers to be called when the Deferred object is rejected.

deferred.catch( fn ) is an alias to deferred.then( null, fn ). Read its page for more information.

Example:

Since the jQuery.get method returns a jqXHR object, which is derived from a Deferred object, we can rejection handlers using the .catch method.

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$.get( "test.php" )
  .then( function() {
    alert( "$.get succeeded" );
  } )
  .catch( function() {
    alert( "$.get failed!" );
  } );