How to find the cumulative sum from 1 to 100 using javascript

Method: 1. Use the "for (var i=1;i

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

Use javascript to add up from 1 to 100

In javascript, if you want to add up from 1 to 100, you can use a for loop statement

Use a for loop to traverse 1 to 100

for (var i = 1; i <= 100; i++) {
}

In the loop body, just add the traversed numbers. There are two ways to write them (just choose one):

sum += i;
//或
sum = sum + i;

After the loop ends, the value of variable sum will be the cumulative value from 1 to 100, and then output it.

The complete implementation code is given below:

function sum(n) {
	var sum=0; 
	for (var i=1;i<=n;i++){
		sum += i;
	}
	return sum;
}
console.log("1到100的累加为："+sum(100));

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