Question

我刚刚在YouTube上观看5个视频，了解了什么是递归。

这个想法更清晰，但不够清楚，我猜我自己的递归函数只在控制台中显示一次发誓。

/*
*     @param {string} swear - your insult
*     @param {number} times - how many times to repeat
*/
var recursiveSwear = function(swear, times){
    if(times == 1)
        return swear;
    else
        return recursiveSwear(swear, times - 1);
};

console.log(recursiveSwear("You bastard!", 6));

// Desired output:
//  You Bastard!
//  You Bastard!
//  You Bastard!
//  You Bastard!
//  You Bastard!
//  You Bastard!

//Actual output:
//  You Bastard!

Answer 1

你的功能很好，但你没有记录＆＃34;发誓＆＃34;

var recursiveSwear = function(swear, times){
    if(times == 1)
        return swear;
    else
        console.log(swear); //log them here
        return recursiveSwear(swear, times - 1);
};

console.log(recursiveSwear("Shut up!", 6));

Answer 2

在进行递归工作时，通常需要将当前值与递归调用的返回值结合使用。在这种情况下，您可以按如下方式附加它们：

var recursiveSwear = function(swear, times){
    if(times == 1)
        return swear;
    else
        return swear + ' ' + recursiveSwear(swear, times - 1);
};

console.log(recursiveSwear("Oh darn!~", 6));

Answer 3

递归函数的主体实际上没有任何类型的输出。你不应该在2015-06-29T20:50:16.244+0100|Warning: StandardWrapperValve[Jersey Web Application]: Servlet.service() for servlet Jersey Web Application threw exception java.lang.NoClassDefFoundError: org/owasp/esapi/ESAPI at com.pododdle.util.ToJSON.toJSONArray(ToJSON.java:60) at com.pododdle.dao.MySQL.runDBQuery(MySQL.java:55) at com.pododdle.service.CategoryService.getAllCategories(CategoryService.java:10) at com.pododdle.resources.CategoryResource.getCategories(CategoryResource.java:22) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:497)条款中移动你的console.log吗？ e.g：

else

递归咒骂功能

3 个答案: