guid | 易学教程

Understanding Dean Edwards' addevent JavaScript

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问题 I need help understanding this piece of code. What is the point of handler.guid ? Why is there a need for a hash table? What is the point of: if ( element["on" + type]) { handlers[0] = element["on" + type]; } What does the "this" refer to in handleEvent , the element or the the addEvent function? function addEvent(element, type, handler) { // assign each event handler a unique ID if (!handler.$$guid) handler.$$guid = addEvent.guid++; // create a hash table of event types for the element if (

Is there a way to distinguish a GUID from just a random number?

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问题 Being able to distinguish a GUID from random data can be useful when debugging obscure code defects. On Windows each GUID generated is of version 4 therefore it has '4' as the first half-byte of the third part. So if the 16-byte sequence violtates that rule it is not a version 4 GUID. For example, 567E1ECB-EA1C-42D3-A3ED-87A5D824D167 could be either a version 4 GUID or anything else, but 567E1ECB-EA1C-02D3-A3ED-87A5D824D167 //third section starts with 0, not with 4 is not a version 4 GUID.

How to generate random unique 16 digit number in asp.net without collision

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问题 how can i generate 16 digit unique random numbers without any repetition in c# asp.net, as i have read the concept of GUID which generate characters along with numbers but i don't want characters kindly suggest is there any way to acheive it 回答1: You can create a random number using the Random class: private static Random RNG = new Random(); public string Create16DigitString() { var builder = new StringBuilder(); while (builder.Length < 16) { builder.Append(RNG.Next(10).ToString()); } return

How to generate short uid like “aX4j9Z” (in JS)

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问题 For my web application (in JavaScript) I want to generate short guids (for different objects - that are actually different types - strings and arrays of strings) I want something like "aX4j9Z" for my uids (guids). So these uids should be lightweight enough for web transfer and js string processing and quite unique for not a huge structure (not more than 10k elements). By saying "quite unique" I mean that after the generation of the uid I could check whether this uid does already exist in the

asp.net mvc5 WebUploader多文件大文件上传

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1、首先加载 <link rel="stylesheet" type="text/css" href="~/Content/scripts/plugins/webuploader/webuploader.css"> <script type="text/javascript" src="~/Content/scripts/plugins/webuploader/webuploader.js"></script> 2、在页面中放入DIV <div id="uploader" class="wu-example">  <div id="thelist" class="uploader-list"></div> <div class="btns"> <div id="picker">选择文件</div> <input id="ctlBtn" type="button" value="开始上传" class="btn btn-default" /> </div> </div> 3、初始化 WebUploader <script> var applicationPath = window.applicationPath === "" ? "" : window.applicationPath || "../../"; var GUID = WebUploader

How does C# generate GUIDs?

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问题 How are GUIDs generated in C#? 回答1: Original question: How the Guid is generating it's identifier?? How will be it's output if I use the following code Guid g = Guid.NewGuid(); Whether the output will be the combination of numbers and lettters or the numbers alone will be there??? A .Net System.Guid is just a 128-bit integer (16 bytes). Numbers and letters have nothing to do with it. You can use the ToString() method to see various "human-readable" versions of a Guid, which include numbers 0

GUID to ByteArray

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问题 I just wrote this code to convert a GUID into a byte array. Can anyone shoot any holes in it or suggest something better? public static byte[] getGuidAsByteArray(){ UUID uuid = UUID.randomUUID(); long longOne = uuid.getMostSignificantBits(); long longTwo = uuid.getLeastSignificantBits(); return new byte[] { (byte)(longOne >>> 56), (byte)(longOne >>> 48), (byte)(longOne >>> 40), (byte)(longOne >>> 32), (byte)(longOne >>> 24), (byte)(longOne >>> 16), (byte)(longOne >>> 8), (byte) longOne, (byte

Sequential GUIDs

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问题 I hope someone can answer this question. How does the UuidCreateSequential method in the rpcrt4.dll class use to seed it's guids? I know this much: Microsoft changed the UuidCreate function so it no longer uses the machine's MAC address as part of the UUID. Since CoCreateGuid calls UuidCreate to get its GUID, its output also changed. If you still like the GUIDs to be generated in sequential order (helpful for keeping a related group of GUIDs together in the system registry), you can use the

Are GUIDs necessary to use interfaces in Delphi?

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问题 The official documentation says they are optional. I know COM interop requires a unique identifier for each interface but every interface example I see has a GUID whether it's used with COM or not? Is there any benefit to including a GUID if its not going to be used with COM? 回答1: I've noticed that some methods such as Supports (to determine if a class conforms to a specific interface) require that you define a GUID before you can use them. This page confirms it with the following information

php上传文件夹的解决方案

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前段时间做视频上传业务，通过网页上传视频到服务器。视频大小小则几十M，大则 1G+，以一般的HTTP请求发送数据的方式的话，会遇到的问题：1，文件过大，超出服务端的请求大小限制；2，请求时间过长，请求超时；3，传输中断，必须重新上传导致前功尽弃；解决方案： 1，修改服务端上传的限制配置；Nginx 以及 PHP 的上传文件限制不宜过大，一般5M 左右为好； 2，大文件分片，一片一片的传到服务端，再由服务端合并。这么做的好处在于一旦上传失败只是损失一个分片而已，不用整个文件重传，而且每个分片的大小可以控制在4MB以内，服务端限制在4M即可。前端 Web前端可使用HttpUploader6的大文件上传控件6；官网地址： http://t.cn/EyI6vHh <div class="section section6 section5"> <div class="part1"><a href="javascript:;" target="_blank" class="part1__btn">批量删除</a><span class="part1__txt"><em class="part1__num" id="upload_num">0</em>个视频，共 <em class="part1__num" id="upload_size">0M</em></span></div>