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                # 迭代器模式 迭代器模式中,迭代器(允許我們遍歷集合中所有元素的對象)順序迭代一個集合對象中的元素而無需暴漏其底層形式。 迭代器封裝了這種特別的迭代操作的內部結構,就jQuery的jQuery.fn.each()迭代器來說,我們實際上可以使用jQuery.each()底層的代碼來迭代一個集合,而無需知道或者理解后臺提供這種功能的代碼是如何實現的。 這種模式可以被理解為門面模式的一種特例,在這里我們只處理與迭代有關的問題。 ~~~ $.each( ["john","dave","rick","julian"] , function( index, value ) { console.log( index + ": "" + value); }); $( "li" ).each( function ( index ) { console.log( index + ": " + $( this ).text()); }); ~~~ 這里我們可以看到jQuery.fn.each()的代碼: ~~~ // Execute a callback for every element in the matched set. each: function( callback, args ) { return jQuery.each( this, callback, args ); } ~~~ 在jQuery.each()方法后面的代碼提供了兩種迭代對象的方法: ~~~ each: function( object, callback, args ) { var name, i = 0, length = object.length, isObj = length === undefined || jQuery.isFunction( object ); if ( args ) { if ( isObj ) { for ( name in object ) { if ( callback.apply( object[ name ], args ) === false ) { break; } } } else { for ( ; i < length; ) { if ( callback.apply( object[ i++ ], args ) === false ) { break; } } } // A special, fast, case for the most common use of each } else { if ( isObj ) { for ( name in object ) { if ( callback.call( object[ name ], name, object[ name ] ) === false ) { break; } } } else { for ( ; i < length; ) { if ( callback.call( object[ i ], i, object[ i++ ] ) === false ) { break; } } } } return object; }; ~~~
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