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  allbacks.disable
  
  描述: 禁用回调列表中的回调
  
  添加的版本: 1.7callbacks.disable()
  
  这个方法不接受任何参数
  
  此方法返回绑定它的那个回调对象(this).
  
  Example
  
  使用 callbacks.disable() 禁止回调列表中的回调进一步的调用:
  
  // a sample logging function to be added to a callbacks list
  
  var foo = function( value ) {
  
  console.log( value );
  
  };
  
  var callbacks = $.Callbacks();
  
  // add the above function to the list
  
  callbacks.add( foo );
  
  // fire the items on the list
  
  callbacks.fire( "foo" );
  
  // outputs: foo
  
  // disable further calls being possible
  
  callbacks.disable();
  
  // attempt to fire with "foobar" as an argument
  
  callbacks.fire( "foobar" );
  
  // foobar isn't output

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