使用Javascript / E4X计算XML片段中的节点数

<pets>       
 <pet type="dog">Barney</pet>
 <pet type="cat">Socks</pet>
</pets>

使用E4X XML对象构建“宠物”节点的XMLList.然后,您可以在XMLList上调用length方法.

//<pets>
//    <pet type="dog">Barney</pet>
//    <pet type="cat">Socks</pet>
//</pets>  

// initialized to some XML resembling your example
var petsXML = new XML("");  

// build XMLList
var petList = petsXML['pet'];  

// alternative syntax
// var petList = petsXMl.pet;  

// how many pet nodes are under a given pets node?
var length = petList.length();