当序号大于10的时候有问题了

1."Pb1"
2."Pb2"
3."Pb2"
4."Pb3"
5."Pb2"
6."Pb3"
7."Pb4"
8."Pb4"
9."Pb1"
10."Pb1"
11."Pb4"
12."Pb2"
13."Pb1"
14."Pb3"

去除后

"Pb1"
"Pb2"
"Pb2"
"Pb3"
"Pb2"
"Pb3"
"Pb4"
"Pb4"
"Pb1"
1"Pb1"
1"Pb4"
1"Pb2"
1"Pb1"
1"Pb3" 多了一个1大于10后20后30后都没有试验