JS implements a method of finding duplicate rows for a sorted string _javascript tips

The example of this article is about the method that JS realizes to find the duplicate line for the sorted string. Share to everyone for your reference, specific as follows:

To achieve such a requirement, in a editplus document, there are a number of rows of 10 digits, which have been sorted out.

Like what:

1234567890
1234567891
1234567892
1234534124
1234614124
4321412414
5636373573

Is there any way to easily find the same number of two lines at least the first 7 digits?

For example, in the numbers above, you can find

1234567890
1234567891
1234567892

<! DOCTYPE HTML PUBLIC "-//W3C//DTD XHTML 1.0 transitional//en" "Http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd
    ">  

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I hope this article will help you with JavaScript programming.