JS常用的设计模式(12)—— 迭代器模式

forEach = function( ary, fn ){  for ( var i = 0, l = ary.length; i < l; i++ ){    var c = ary[ i ];    if ( fn.call( c, i , c ) === false ){      return false;    }   }}
forEach( [ 1, 2, 3 ], function( i, n ){
alert ( i );
})

forEach = function( obj, fn ){  for ( var i in obj ){    var c = obj[ i ];    if ( fn.call( c, i, c ) === false ){      return false;    }   }}
forEach( {"a": 1,"b": 2}, function( i, n ){
alert ( i );
})