infinite | 易学教程

[XState] Track Infinite States with with XState Context

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Consider a text input. It would be impossible for anyone to model every value you could possibly put into it, because the number of possible values is infinite. This is an infinite state. Infinite state can be tracked and utilized by XState machines as "extended state". This extended state is called context . Context is passed to every function that is triggered by the machine: actions, activities, guards, and more. In this lesson we learn how to set context and update it through assign actions. const { Machine, interpret, assign } = require("xstate"); const inputMachine = Machine( { id:

关于Could not write JSON: Infinite recursion (StackOverflowError)的解决思路

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之前在开发过程中遇到的一些坑因为比较忙所以一直没时间把它们记录下来，今天恰好有比较多的空闲时间，所以尽快来总结下吧！不知道大家在开发过程中序列化对象到前端时是否会碰到 Could not write JSON: Infinite recursion (StackOverflowError) 这样的报错，本人在之前跟前端联调时就遇到了这种情况。也就是如下图的报错：遇到问题我们首先得分析出其中的原因，然后再寻求解决方案。那么是什么导致了这种报错呢？首先我们可以从字面上理解这个报错，Could not write JSON: Infinite recursion (StackOverflowError) 从字面上可以看出，无法写JSON，也就是序列化对象成json时报错了，报错的原因是无限递归所导致的。那么好端端的为什么凭空的就出现这种报错呢？百思不得其解的我google了一下发现，当我们序列化entities with bidirectional relationships(具有双向关系的实体)时，如果不采取相关的对应策略，就会出现这种情况。举个栗子吧，如果有如下这样的两个实体：相信细心的同学可以发现User实体里面包含了Item实体，而Item实体里面也包含了User实体，所以当我们尝试去序列化时就会出现如下的报错：从报错信息中可以看出

webkitAnimationEnd动画事件

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在前面的文章中也有介绍过css3动画的内容，可见《关于transition和animation 》和《 webkitAnimationEnd动画事件》，今天又要唠叨一下这个东西了，随着知道的越多，然后就会发现自己还有更多的不知道。今天主要说的是利用animate制作帧动画。我们常见的loading效果，很多的动画效果并不是连续运动，而是一种逐帧运动的感觉。看一个简单的需要制作动画效果的图片：甚至就包括我们在这里写博客上传图片，等待上传这个过程中的loading动画，明显的效果是不能连续转动，不然总感觉傻傻的，最开始我也做了一个傻傻的连续旋转的动画，不知道怎么上传这种效果，没法只管的演示，我把所有代码全都贴上自己可以观察一下。 <div class="loading"></div> .loading{ width: 1.12rem; height: 1.12rem; position: absolute; left: 50%; margin-left: -0.56rem; top: 35%; z-index: 2; background: url(../images/loading.png) no-repeat center center; background-size: contain; -webkit-animation: rorates 4s infinite

扫什么，评什么

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今天打开朋友圈，许多朋友都在发“扫什么评什么”，虽然这个只是一个朋友圈游戏，但是作为一个程序员，总是想去研究一下他到底是怎么实现的，打开源代码一看便知道怎么来实现这么一个“游戏”。接下来，简单的分析一下，有过网站基础的朋友一看就知道怎么来实现的，并没有什么技术含量。界面代码我们先不管复制怎么显示，只要“变化”的文字实现原理引用文字 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>你也来试试！</title> <meta name="viewport" content="width=device-width, initial-scale=1.0, minimum-scale=1.0, maximum-scale=1.0 user-scalable=no"> <script src="http://css.0826.cc/w/clipboard.min.js"></script> <script type="text/javascript" src="http://libs.baidu.com/jquery/1.10.2

GetView in BaseAdapter Calling Infinte Time

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问题 In app i am loading data from Url and displaying it in list view.Total Item which I retrieve from Url is 5 Item, Which are displayed successfully in listview.But getView() runs infinite times at backend. IT keeps on calling till activity is alive .I am unable to figure it why it is calling so much time. My code is public class asasa extends Activity { //ListView listView; Intent intent; public int currentimageindex=0; private ProgressDialog pDialog; //Class Declartion DataHolder DataHolder

Best infinite loop [duplicate]

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问题 This question already has answers here : Closed 9 years ago . Possible Duplicate: while (1) Vs. for (;;) Is there a speed difference? Hi, Which is better,faster and more optimized way to implement infinite loop - for(;;) or while(1)? and why? 回答1: In any normal compiler, there should be absolutely no difference. For example, here's what LLVM-clang generates (with the -O3 flag) for while (1) {} : .file "test.c" .text .globl main .align 16, 0x90 .type main,@function main: pushl %ebp movl %esp,

Codeforces Round #597 (Div. 2)

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A.Good ol' Numbers Coloring 题目大意：如果涂成黑色块的块数无限，输出infinite，如果有限，输出finite。分析：只用判断一下gcd是不是等于1，如果等于1，输出finite，如果不等于1，输出infinite。代码： def gcd(a, b): if b == 0: return a else: return gcd(b, a % b) t = input() t = int(t) for i in range(t): a, b = input().split() a = int(a) b = int(b) if gcd(a, b) == 1: print("Finite") else: print("Infinite") B.Restricted RPS 题目大意：石头剪刀布的游戏，一个人的出石头剪刀布的情况是已知的，另一个人是未知的，但是你知道另外一个人的出的次数的情况。让你找一种可以让那个人赢的情况，如果不能的话，输出NO，否则输出YES，并输出一种可行的方法。分析：贪心即可，先尽量让第一个人赢，看看能赢不，再把剩下的往上添就好了。代码： t = input() t = int(t) for i in range(t): n = input() n = int(n) a, b, c = input().split() a =

socket read timed out - should I go for 0 (inifite)

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问题 I'm downloading a big file (say around 100mb) and I'm receiving SocketException: Read timed out every now and then. I'm thinking of raising the socket timeout. Actually, I'm thinking of setting the socket timeout to 0 (infinite) as eventually the sizes that the files that my app will be downloading may even go greater than 300mb, or even greater than 300mb. Is this a good practice? Regarding socket timeout, when does the timeout countdown actually starts? I mean, when a socket timeout occurs,

Problem with reading from file causing infinite loop

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问题 Ok this program I am working on seems to be all ok except there is a problem. Here is the code #include <iostream> #include <fstream> using namespace std; /* Function Name: CalculateBinary CalculateBinary takes a number from the main function and finds its binary form. */ void CalculateBinary( long InputNum) { //Takes InputNum and divides it down to "1" or "0" so that it can be put in binary form. if ( InputNum != 1 && InputNum != 0) CalculateBinary(InputNum/2); // If the number has no

CSS3+HTML5特效9 - 简单的时钟

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原文: CSS3+HTML5特效9 - 简单的时钟效果演示(加快了100倍) /*--> */ /*--> */ 实现原理利用CSS3的transform-origin 及 transform 完成以上效果。代码及说明 1 <style> 2 @-webkit-keyframes rotateLabel { 3 0%{ 4 -webkit-transform-origin:0% 100%; 5 -webkit-transform: rotate(0deg); 6 } 7 100%{ 8 -webkit-transform-origin:0% 100%; 9 -webkit-transform: rotate(360deg); 10 } 11 } 12 13 @keyframes rotateLabel { 14 0%{ 15 transform-origin:0% 100%; 16 transform: rotate(0deg); 17 } 18 100%{ 19 transform-origin:0% 100%; 20 transform: rotate(360deg); 21 } 22 } 23 .hour 24 { 25 position: absolute; 26 top: 60px; 27 left: 200px; 28 width: 1px; 29 height:

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