JS generates a random string of alphanumeric combinations

Preface

Recently there is a need to generate a random string of 3-32-bit-length alphanumeric combinations, and the other is to generate a 43-bit random string.

Method a wonderful way of writing

1	Math. Random(). ToString(+). Substr(2);

Output results

Explain

Very interesting, studied, basically the parameters after ToString can be any integer between 2-36, the default is 10 (that is, decimal), the value returned is the random number.

• If even, the returned numeric string is short, and if it is odd, the returned value will be a large representation of the length.
• If <10 are numbers, >10 will contain letters.

So if you want to get a long string of random characters, you need to use a > 10 and an odd number of parameters, in addition to the length of their own use slice (2,n) intercept!

Method Two

This is a lot of implementation methods, because the last one is not quite in line with the requirements so write the next one, welcome to shoot bricks.

Code

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/** * Randomword produces random alphanumeric combinations of any length* * randomflag-whether any length min-any length minimum bit [fixed number] max-any length maximum bit* * Xuanfeng 2014-08-28*/ function randomword(randomflag, min, max){ var str = "", range = min, Arr = [' 0 ', ' 1 ', ' 2 ', ' 3 ', ' 4 ', ' 5 ', ' 6 ', ' 7 ', ' 8 ', ' 9 ', A, ' B ', C, ' d ', E, ' F ', ' G ', ' H ', I, ' J ', K, L, ' m ', N, ' O ', ' P ', ' Q ', ' R ', ' s ', ' t ', ' U ', ' V ', ' W ', ' X ', ' Y ', ' Z ', A, B, C, D, E, F, G, H, ' I ', J, K, L, M, N, O, P, ' Q ' , ' R ' , ' s ' , ' T ' , ' U ' , ' V ' , ' W ' , ' X ' , Y ' , ' Z ' ] //randomly generated if(randomflag){         range = mathround (math.random ( * (max-min) ) + min     }For (var i=0; I<range; I+ +){         pos = Mathround (math.random ( * (arrlength-1) str + = arr[pos];     } return str; }

How to use

• Generate 3-32-bit random strings: Randomword (True, 3, 32)
• Generate 43-bit random string: Randomword (False, 43)

JS generates a random string of alphanumeric combinations