[Tips] Format number and Round Number with Javascript

Hello everybody Today is September 9, 2018 is a very special day, and I was also free, I would like to introduce to you rounded numbers in javascript, In fact, the rounding technique is not strange, but master about it you need a certain amount of time, to help you save energy, today I decided to summarize and share my experience about rounding the numbers from decimal and integers, so that

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