FOM 参照 > DOM Support > DOM > NodeList interface
NodeList interface
The NodeList interface provides the abstraction of an ordered collection of nodes, without defining or constraining how this collection is implemented. NodeList objects in the DOM are live.
The items in the NodeList are accessible via an integral index, starting from 0.
length attribute
The number of nodes in the list. The range of valid child node indices is 0 to length-1 inclusive.
length
Access
read-only
Returns
unsigned long
item method
Returns the indexth item in the collection. If index is greater than or equal to the number of nodes in the list, this returns null.
item nodeindex
Parameters
unsigned long nodeindex
Index into the collection.
Returns
Node. The node at the indexth position in the NodeList, or null if that is not a valid index.
Parent topic 
DOM
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