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//取该对象内第3个file
var file = myJSON.objJSON[2].files;
//取得file列表中第2的文件名
var fName = file[1].name;
var myJSON = {"objJSON":[
{"name":"a1","value":"unique1","files":[{"name":"a1-1"},{"name":"a1-2"},{"name":"a1-3"}]},
{"name":"a1","value":"unique2","files":[{"name":"a1-1"},{"name":"a1-2"},{"name":"a1-3"}]},
{"name":"a1","value":"unique3","files":[{"name":"a1-1"},{"name":"a1-2"},{"name":"a1-3"}]},
{"name":"a1","value":"unique4","files":[{"name":"a1-1"},{"name":"a1-2"},{"name":"a1-3"}]},
{"name":"a1","value":"unique5","files":[{"name":"a1-1"},{"name":"a1-2"},{"name":"a1-3"}]}
]}
//取出某个files下面的所有节点
for(var i=0;i<myJSON.objJSON.length;i++){
var arr = myJSON.objJSON[i].files;
for(var j=0;j<arr.length;j++){
alert(arr[j].name);
}
}