In "Detailed explanation of how to multiply and divide two numbers through javascript", we introduce how to multiply and divide two numbers through javascript. Interested friends can Learn and learn~
The topic of this article is "How to write a JavaScript function to calculate the factors of a positive integer"?
So what is the factor? This belongs to elementary school knowledge. Everyone should know that a factor means that the quotient of an integer a divided by an integer b (b≠0) is exactly an integer without a remainder. We say that b is a factor of a.
After understanding what a factor is, we can easily calculate the factor of a positive integer through js code.
The complete implementation code is as follows:
<!DOCTYPE html>
<html>
<head>
<meta charset=utf-8 />
<title></title>
</head>
<body>
<script>
function factors(n)
{
var num_factors = [], i;
for (i = 1; i <= Math.floor(Math.sqrt(n)); i += 1)
if (n % i === 0)
{
num_factors.push(i);
if (n / i !== i)
num_factors.push(n / i);
}
num_factors.sort(function(x, y)
{
return x - y;}); // 数字排序
return num_factors;
}
console.log(factors(15)); // [1,3,5,15]
console.log(factors(16)); // [1,2,4,8,16]
console.log(factors(17)); // [1,17]
</script>
</body>
</html>We still use console.log() to view the output information, as follows:
Obviously the factors of 15, 16, and 17 are [1,3,5,15], [1,2,4,8,16], [1,17] respectively.
In the above code, the methods that everyone needs to know are:
sqrt()Method: can return the square root of a number;
→Note: The Math.pow() method can calculate any root of a number.
floor()Method: A number can be rounded down;
→Note: The floor() method performs downward rounding Rounding calculation, it returns the nearest integer that is less than or equal to the function parameter.
push()Method: One or more elements can be added to the end of the array and the new length is returned;
→Note: This method will change the length of the array. To add one or more elements to the beginning of the array, use the unshift() method.
sort()Method: used to sort the elements of the array.
→Note: The array is sorted on the original array and no copy is generated.
Finally, I would like to recommend "JavaScript Basics Tutorial" ~ Welcome everyone to learn ~
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