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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