有可能会访问到重复的元件，如果是已经访问过的就不添加了。

Signed-off-by: dmy@lab <dmy@lab.lab>

testHasttable/main.cpp

@@ -7,10 +7,10 @@ int main(int argc, char *argv[])
 {
     QCoreApplication a(argc, argv);
 //    ReadWrite aa;
-    RegexExtract re;
-    re.extract("D:/Project/佛山项目/数据/df8003/df8600/exportfiles/exportmodel_pw.xml");
-    re.exportBlocks("./a");
-    return a.exec();
+//    RegexExtract re;
+//    re.extract("D:/Project/佛山项目/数据/df8003/df8600/exportfiles/exportmodel_pw.xml");
+//    re.exportBlocks("./a");
+//    return a.exec();
     ElementHashtable eleReader;
     eleReader.Parse("D:/Project/佛山项目/数据/df8003/df8600/exportfiles/exportmodel_pw.xml","D:/Project/佛山项目/佛山收资/exportmodel_zwyth20141204/exportmodel_zwyth.xml");
 //    eleReader.GoPath();