How to find the factorial from 1 to 20 in javascript

In JavaScript, you can find the factorial from 1 to 20 by nesting 2 levels of for loops. The specific syntax is "for(var i=1;i

The operating environment of this tutorial: windows7 system, javascript version 1.8.5, Dell G3 computer.

In JavaScript, we can nest 2 levels of for loops to find the factorial from 1 to 20.

The implementation idea of ​​N factorial:

• Because to find the factorial of n is to find 1 multiplied by 2 multiplied by 3...keep multiplying to the product of n. Therefore, the initial condition of the for loop can be set to i = 1, and the restriction condition can be i

• Then the loop body is the multiplication operation. Multiply the i value of each loop to get a product
  

• Finally output the product

The implementation code for finding 20 factorials is given below:

var sum = 1;
for (var i = 1; i <= 20; i++) {
    sum *= i;
}
console.log( "20的阶乘为： " + sum);

The output result is:

If you want to ask for the factorial from 1 to 20, you need to make some modifications based on the above code, and add a for loop outside to control what factorial is being searched for

for(var i=1;i<=20;i++){
	var sum = 1;
	for (var j = 1; j <= i; j++) {
		sum *= j;
	}
	console.log( i+"的阶乘为： " + sum);
}

The output result is:

[Recommended learning: javascript advanced tutorial】

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