JS floating point subtraction accuracy is not accurate

pow

make a note for a rainy future . AdditionNumber.prototype.add =functionARG) {var r1,r2,m;try{r1=This.tostring (). Split (".") [1].length}catch (e) {r1=0}Try{r2=arg.tostring (). Split (".") [1].length}catch (e) {r2=0} m=Math.pow (10,Math.max

Determine how the PHP program is running (browser, command line)

PHP programs can be accessed through the browser (typically Apache, Nginx and other servers),can also be run directly from the command line (CLI execution)If you need to determine how the current program is executed, how should you judge it, using:

Golang Series article: Crawling Web content

Today, write a simple program that captures the content of the Web page according to the specified URL and then stores it in a local file. This program will involve network requests and file operations and other knowledge points, the following is

Test controller with MOCKMVC

Before we tested the controller just as a pojo for a simple test, after spring3.2 we can follow the controller's way to test the Spring MVC controller, so when the test controller, There is no need to start the Web server and Web browser again, the

Learn jquery and get started with this paper

References to jqueryLocal File Introduction:Content Distributed Network CDNNon-condensed version developmentCompressed version official releasejquery Source AnalysisHttp://www.cnblogs.com/aaronjs/p/3279314.htmlHow to tell if jquery was really

JS advanced Written exam must be the problem

1. var name = ' world! ';(function () {if (typeof name = = = ' undefined ') {var name = ' Jack ';Console.log (' Goodbye ' + name);} else {Console.log (' Hello ' + name);}})();2.var a = 10;function fn () {Console.log (a);}function Bar (f) {var a = 20;

Comparison of several popular Ajax frameworks: Jquery,mootools,dojo,extjs,dwr

1:jqueryHome: http://jquery.com/Design idea: A concise idea of the scheme, almost all operations are to choose the DOM element (with strong selector) to start, and then the operation of it (chaining and other characteristics).Advantages:The file is

Working with JSON

Description#json是一种通用的数据类型, all languages are known.#k-V {}#json串就是一个字符串, can not be based on key-value value#json可以转成字典#json串就是字符串, can be placed in three quotation marksVerify the JSON format URL: http://www.bejson.com/So how does json turn into a

In-depth understanding of node. JS Event-driven callbacks

relationship of callbacks and asynchronous invocationsFirst, make it clear that callbacks are not asynchronous calls, and callbacks are a way of handling the results of asynchronous function execution. In an asynchronous invocation, if we want to

Pure CSS Implementation custom checkbox check box

Words not much to say, straight into the subject. It is well known that the native checkbox check box, radio radio button, select Selection box, different browsers differ greatly, the most important point is not very good-looking, if directly take

FTP Upload file encapsulation

Business requirements, the frequent transfer of pictures to the other FTP server, with this code can stream upload files.Upload Code1 #Coding:utf-82 ImportFtplib3 ImportLogging4 ImportTraceback5 6 defFTPLogin ():7LastErr =None8 forIinchRange (3)

Front-end base------CSS

declaration must be the first line in the HTML document, before the tag. declaration is not an HTML tag; it is a directive that instructs the Web browser to write which HTML version of the page to use. HTML Document Structure: 1, is declared as a

JS Time delay

Td-dojoSetTimeout (Dojo.hitch (this, function () {This.onclickcount ();}), 3000);General applicationIn JS, there are two types of deferred execution functions, settimeout and setinterval, which are used as follows:function TestFunction ()

How ArcGIS for JS draws Typhoon Cone

Transferred from: 78984533#commentboxArcGIS for JS inside, drawing a circle is not difficult. Small can be used SimpleMarkerSymbol , "style": "esriSMSCircle" ;Big words, directly to anew CircleBut what if it is similar to Typhoon cone?Like a circle,

Vue.js directive

I. Learning Objectives Understand what a vue.js directive is Understand the purpose of the Vue.js directive Mastering the writing standard of vue.js instruction Ability to use vue.js instructions to complete departmental page

Javascript Regular Expression usage Summary

Javascript Regular Expression usage:Copy codeThe Code is as follows:Function checkreg (myreg, mytext){If (myreg. test (mytext){Alert ("OK ");Return true;}Else{Return false;}}// ANOTHER METHODCopy codeThe Code is as follows:Function checkreg (myreg,

Asp Regular Expression checks functions starting with http

'####################################'Function: ishttp [str]'Parameter: str, string to be processed'Author: Mu'Date: 2007/7/12'Description: checks whether the HTTP connection address or address bar starts with HTTP.'Example: '########################

PHP Regular Expression recommendation

Mind MapClick to view details!Introduction Regular Expressions are frequently used in development. Many development languages now have regular expressions, such as javascript, java, and ,. net, php, etc. Today I will share my understanding of

Use regular expressions in javascript to delete leading and trailing spaces in strings

InstanceCopy codeThe Code is as follows: InstanceSimulate RTrim:Copy codeThe Code is as follows: InstanceThe code and test code are as follows:Copy codeThe Code is as follows: The test results are as follows:Copy codeThe Code is as follows:Length: 11

Regular Expression sorting for JQuery numeric type verification

Copy codeThe Code is as follows:Var regexEnum ={Intege: "^ -? [1-9] // d * $ ", // integerIntege1: "^ [1-9] // d * $", // positive integerIntege2: "^-[1-9] // d * $", // negative integerNum: "^ ([+-]?) // D *//.? // D + $ ", // numberNum1: "^ ([1-9]

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