Javascript code to generate a random number within a specified range _ javascript skills

I found out after checking the manual that the information I introduced was poor. I didn't introduce the generation of random numbers in the m-n range ..., just give you a Math. random. however, after a small effort, I finally touched the door and solved the problem.
Then, a formula is written, which should disappear. formula:
1. Starting from 1 to any value
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ParseInt (Math. random () * Upper Limit + 1 );
2. From any value to any value
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ParseInt (Math. random () * (upper limit-lower limit + 1) + lower limit );
The above formula uses parseInt (), so we need to add 1; if we use Math. ceil (), we do not need to add 1. I am used to writing this...
Directory:
1. Demo 1 (directly generate a random number)
2. DEMO 2 (write as a function to generate a random number)
1. Demo 1 (directly generate a random number)
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