Javascript implementation to obtain string hash value_javascript skills

A very high-performance function for calculating hash values ​​of strings or files. It is much faster than md5. I use it all the time. The probability of duplication is very low. It is sufficient for general applications.

var I64BIT_TABLE =
 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789_-'.split('');
 
function hash(input){
 var hash = 5381;
 var i = input.length - 1;
 
 if(typeof input == 'string'){
  for (; i > -1; i--)
   hash += (hash << 5) + input.charCodeAt(i);
 }
 else{
  for (; i > -1; i--)
   hash += (hash << 5) + input[i];
 }
 var value = hash & 0x7FFFFFFF;
 
 var retValue = '';
 do{
  retValue += I64BIT_TABLE[value & 0x3F];
 }
 while(value >>= 6);
 
 return retValue;
}

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