Want to seek advice what is the difference between these two approaches, the results from a feedback as a result, one can't feedback, want to know the reason of those

Method one:
The function Person () {
}
Person. The prototype. The name='Jimmy';
Person. The prototype. The age=29;
='the Teacher' Person. The prototype. The job;
Person. The prototype. SayName=function () {
Alert (enclosing name);
}
Var keys=Object. Keys (Person. The prototype);
Alert (keys)

Method 2:
The function Person () {
Person. The prototype. The name='Jimmy';
Person. The prototype. The age=29;
='the Teacher' Person. The prototype. The job;
Person. The prototype. SayName=function () {
Alert (enclosing name);
}
}
Var keys=Object. Keys (Person. The prototype);
Alert (keys)