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javascript对象机制

                var currItem = listbox.options[currIndex];
                var prevItem = listbox.options[currIndex - 1];
                //alert(currItem);
                alert(prevItem.text);
                listbox.options[currIndex - 1].text = currItem.text;
                listbox.options[currIndex - 1].value = currItem.value;
                alert(prevItem.text);  //两次alert值是不同的
                listbox.options[currIndex].text = prevItem.text;
                listbox.options[currIndex].value = prevItem.value;


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