How to calculate a random number between any values?

Do you know how to calculate a random number ranging from 1 to 10? Let me know,

First, the math. Random () method is used to calculate a random number and return a random number greater than or equal to 0 and less than 1,

Math. random () * 10 isn't it true that the return value is greater than or equal to 0 and less than 10, but he can only return a number smaller than 10, and cannot return 10? What should I do, we add 1 to the original function and it becomes math. random () * 10 + 1; now we can return a random number ranging from 1 to 10, but we return many decimal places, which do not meet the requirements. Math is used below. floor () Is the function, which is rounded down, that is, 10.99 passes through math. all floors are 10, math. ceil (rounded up) returns 11 even if it is 10.00001. Now we can find out the result, math. floor (math. random () * 10 + 1); then the result can be obtained;

What about the functions between 2 and 10? Directly code math. Floor (math. Random () * 9 + 2 );

So what about 3 to 11 and 4 to 88? Every time this is done, it is not a solution. Next we will introduce a general method;

 

Function selectfrom (lowvalue, highvalue ){

VaR choice = highvalue-lowvalue + 1;

Return math. Floor (math. Random () * Choice + lowvalue );

}

Then, directly adjust the above method to OK;

The previous blog is too rough. I'm lucky to give some advice from a garden friend. I will write the naming rules for the future. You are welcome to leave a message to discuss Js.

How to calculate a random number between any values?