这种JS代码题，要如何解？

Question

please create a tool to generate SequenceExpected to be used like:var sequence1 = new Sequence();sequence1.next() --> return 1;sequence1.next() --> return 2;in another module:var sequence2 = new Sequence();sequence2.next() --> 3;sequence2.next() --> 4;

Answer 1

please create a tool to generate Sequence
Expected to be used like:
var sequence1 = new Sequence();
sequence1.next() --> return 1;
sequence1.next() --> return 2;

in another module:
var sequence2 = new Sequence();
sequence2.next() --> 3;
sequence2.next() --> 4;