除IE外的浏览器是将换行符作为内容的文本节点(nodeType为3)。而元素的话，nodeType为1。下面是查找它们的实用方法：
lastSibling:function(node){
var tempObj = node.parentNode.lastChild;
while(tempObj.nodeType!=1 && tempObj.previousSibling!=null)
{
tempObj=tempObj.previousSibling;
}
return (tempObj.nodeType==1)?tempObj:false;
}
这是《深入浅出JavaScript》书中DOMhelp库中lastSibling方法的源码。与 mootools 库中实现源码差不多：
'last-child': function(){
var element = this;
while ((element = element.nextSibling)){
if (element.nodeType == 1) return false;
}
return true;
}
这是在 Mootools 1.2.4 源码中的 last-child() 方法。
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