1.利用 for 循环
var sum = 0;
for (var i = 1; i <= 100; i++) {
sum += i;
}
console.log(sum);
// > 5050
2.利用 while 循环
var sum = 0;
var i = 1;
while (i <= 100) {
sum += i;
i++;
}
console.log(sum);
// > 5050
3.递归累加函数
function accumulation(start, end) {
if (start === end) {
return end;
}
return start + accumulation(start + 1, end);
}
console.log(accumulation(1, 100));
// > 5050
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