function isPrime(number) {   if (typeof number !== ‘number‘) {      // 不是数字      return false;   }   if (number < 2) {      return false;   }    if (number === 2) {      return true;   } else if (number % 2 === 0) {      return false;   }   var squareRoot = Math.sqrt(number);   for(var i = 3; i <= squareRoot; i += 2) {      if (number % i === 0) {         return false;      }   }   return true;}