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  callbacks.empty()
  
  描述: 从列表中删除所有的回调.
  
  添加的版本: 1.7callbacks.empty()
  
  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
  
  用callbacks.empty()清空一个回调的列表:
  
  // a sample logging function to be added to a callbacks list
  
  var foo = function( value1, value2 ) {
  
  console.log( "foo: " + value1 + "," + value2 );
  
  }
  
  // another function to also be added to the list
  
  var bar = function( value1, value2 ){
  
  console.log( "bar: " + value1 + "," + value2 );
  
  }
  
  var callbacks = $.Callbacks();
  
  // add the two functions
  
  callbacks.add( foo );
  
  callbacks.add( bar );
  
  // empty the callbacks list
  
  callbacks.empty();
  
  // check to ensure all callbacks have been removed
  
  console.log( callbacks.has( foo ) );
  
  // false
  
  console.log( callbacks.has( bar ) );
  
  // false

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