The JavaScript base substr (2, 3) 2 is the starting index value of 3 is raised to 3 characters

Town Field Poem:
The Pure Heart sentiment wisdom language, does not have the world name and the benefit. Learn water under the hundred rivers, give up arrogant slow meaning.
Learn to have a small return to feed root, willing to cast a conscience blog. Sincere in this writing experience, willing to see the text to inspire.
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The essence of the blog, in the technical part, more in the town yard a poem. ide:vs2015; Browser: Firefox.
Html+css+js, strong, worth studying hard. The video tutorial of the Preach Intelligence podcast is my Learning Resource, recommended.
If there are any improvements to the blog post, please leave a comment and I'll think it over.

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The JavaScript base substr (2, 3) 2 is the starting index value of 3 is raised to 3 characters