Sets: Firefox 3.0 implements some useful extensions for working with node sets.
Sets： Firefox 3.0实现了一些使用节点集的有用扩展。
This (in the case of expressions representing node sets) allows the nodes to be retrieved incrementally, rather than all at once.
这（在表达式表示节点集的情况下）允许递增检索节点，而不是立即检索所有节点。
Try to design your extension functions so that they use only doubles, strings, booleans, and node-sets as both arguments and return values.
尽量尝试将您的扩展函数设计为仅使用双精度、字符串、布尔和节点集作为实参和返回值的类型。
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