题解 | #字符串字符统计#
斐波那契数列
http://www.nowcoder.com/practice/aa8ffe28ec7c4050b2aa8bc9d26710e9
function fibonacci(n) {
if(n === 1 || n === 2) {
return 1
} else {
let pre2 = 1
let pre1 = 1
let summary = 0
for(let i = 3; i <= n; i++) {
summary = pre2 + pre1
pre2 = pre1
pre1 = summary
}
return summary
}
} 
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