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Summary of basic JavaScript knowledge (7) Recursion

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Release: 2018-03-10 13:27:59
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This time I will bring you a basic knowledge summary of JavaScript. There are a total of eleven knowledge points. Basic JavaScript knowledge summary (7)RecursionThe following is a practical case, one Get up and take a look.

Write a functionRealize the factorial of n

n! = n*(n-1)!;    function mul (n){    //n的阶乘    //for(var i  = 1; i <= n;i ++){    //     num *= i;    //}        if(n == 1){        return 1;    }        return n*mul(n-1);}// 递归mul(5);//找规律//找出口//唯一好处代码简洁
mul(5) ==> 5*mul(4);
mul(4) ==> 4*mul(3);
mul(3) ==> 3*mul(2);
mul(2) ==> 2*mul(1);
//找规律//找出口//例子:写一个斐波那契数列//fb(n) ==fb(n-1)+fb(n-2)function fb(n){    if( n == 1 ||n ==2 ){        return 1;    }    return fb(n-1) + fb(n-2);}
fb(5) ==> fb(4) + fb(3)
fb(4) ==> fb(3) + fb(2)
fb(3) ==> fb(2) + ..
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I believe you have mastered the method after reading the case in this article. For more exciting things, please pay attention to the php Chinese websiteOthersrelated articles!

Related reading:

Basic JavaScript knowledge summary (6) Functions, initial scope (Part 1)

Basics Summary of JavaScript knowledge (6) Function, initial scope (Part 2)

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