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js to get the implementation of random integers in the range
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Example: Math.floor(Math.random()*(10-5) + 5)
Explanation: Math.floor(parameter a)
Math.floor(parameter a) is to obtain the integer part of parameter a, that is, take an integer.
Description: Math.random()
Math.random() is a random number between 0 and 1.
Math.random()*10 is a random number between 0 and 10.
* Combined use: Math.floor(Math.random() 10) => take a random integer between 0 and 10
* Slightly more complicated: Math.floor(Math.random() 10 + 1 ="take a random integer between 1~11
To take a random integer between n~m range: Math.floor(Math.random()*(mn) + n)
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