Javascript-Common regular function (for forgetting to see)

Test : Tests whether a string contains a matching result, contains a return of true, and does not contain a return of false. match: Regular match based on pattern, if matched to, returns match result, such as no match to return null Search : a

Why is it not recommended to use the Eval () function in JavaScript?

Eval CamouflageThe timeout function settimeout and setinterval both accept the string as the first argument, and the string is executed at the global scope because eval is not called directly.Security issuesEval also has a security issue because it

Javascript-object-oriented and prototype (3).

Advanced object-oriented and prototype--common tricksPrototype schema creation object also has its own shortcomings, it omits the constructor parameter initialization of the process, the disadvantage is that the initialized values are consistent.

JavaScript Object-oriented and prototype

/*Factory mode function CreateObject (name,age) {var obj = new Object ();//Create a new object obj.name=name;//the properties of the new object obj.age=age; Obj.run=function () {//New object method return this.name+ "," +this.age+ "... running.";}

JavaScript Regular Expressions

/*Review Var obj= new number (2), alert (number.min_value), var num = new Number (22E3), alert (num), alert (Isfinite (num));// Determine if the specified range is exceeded var person={fname: "John", lname: "Doe", Age:25};var txt= ""; for (x in

The firstchild,lastchild,nextsibling,previoussibling of Javascript--dom

element. FirstChild: Read-only property the first child nodeStandard: FirstChild will contain the text type of the nodeNon-standard: contains only ELEMENT nodeselement. Firstelementchild: Gets the child nodes of the first element type under the read-

JavaScript regular expression longest match (greedy match) and shortest match (lazy match)

Recently in reading Requirejs 2.1.15 source code, the source code at the beginning of the definition of a series of variables, there are 4 regular expressions:var commentregexp =/(\/\* ([\s\s]*?) \*\/| ([^:]|^) \/\/(. *) $)/mg,

Distinguish between type= "Text/javascript" and language= "JavaScript" in script

Content SummaryWhen making a Web page, it is often necessary to use the JS code that the client can run on the page, so you need to add a reference. JS reference generally have type= "Text/javascript" and language= "JavaScript" two ways, but

JavaScript in-depth understanding of JS closures

Closures (closure) are a difficult and unique feature of the JavaScript language, and many advanced applications rely on closures. the scope of a variableTo understand closures, you must first understand the special variable scope of JavaScript.The

Common methods for JavaScript arrays

Determine if an object is an array: instanceof, Array.isarray ()You can use the instanceof operator for a Web page or for a global scope.if instanceof Array) { // Determine if value is an array }instanceof Operator It assumes that there is only

javascript--Bitwise operators

1.NOT The bitwise operator is not represented by ~. The essence of the not operator is to negate the number and then subtract 1. The bitwise operator NOT is a three-step process. A. Converting an operator to a 32-digit number B.

Regular expressions in JavaScript

How to use 1. Create an expression   Methods for creating regular expression classes in javascript: var regex = new RegExp ("\\d{5}") or 2.var regex =/\d{5}/(Recommended) /Expression/is the syntax provided specifically for simplifying regular

Simply record the JavaScript advanced app

I am a. NET programmer but because of the company's needs, the development of offline apps, but in the process of working I found that people around the writing of JavaScript is the process-oriented coding, For my. NET programmer, this situation is

How to tell if a variable is an array, a function, or an object type in JavaScript

ArrayECMAScript5 Array.isarray is the native method of judging arrays, IE9 and above support. For compatibility, in browsers that do not have this method, you can use Object.prototype.toString.call (obj) = = = ' [Object Array] ' instead.var function

Object-oriented programming for JavaScript BASIC programming

JavaScript is an interpreted language, and there is no obvious difference between compile-time and run-time, so a more dynamic approach is needed. JavaScript does not have a formal class concept, and we can use it to create new object types at run

JavaScript BASIC programming variables, objects, data types, and functions

In Web standards, a Web page consists of three parts: structure, expression, and behavior.Structural standard---->XHTML;Presentation Standard----->CSS;Behavioral Standards----->javascript;JavaScript is a programming language specifically designed to

JavaScript data types and conversions

JavaScript data Types 1.Boolean(Boolean) Boolean: (value type) var b1=true;//boolean type 2.number (numeric) Value : (value type) var n1=3.1415926;//numeric type n1.tofixed (3);//rounding retains 3 decimal places. 3 . String var s1= ' hello '

JavaScript Advanced Programming Chapter 5th Object Type---Array---learning experience

1. How to create an array: Use the array constructor: var colors=new Array ()var colors=New Array (+)// L Create an array of 20 items var colors=New Array ("Red", "Blue", "green")// Create an array with 3 strings 2. Use the

Summary of JavaScript syntax error-prone aspects

JavaScript is a dynamic scripting language with a high degree of grammatical freedom and incomplete design maturity. Because of its highly flexible syntax and a variety of other reasons, the code written with it is extremely readable (at least I

Cookie operations in JavaScript

Cookie operations in JavaScript This article describes how to operate cookies in JavaScript, this article describes what are cookies, basic Cookie knowledge, common Cookie problems, two methods for clearing cookies, basic Cookie usage, and advanced

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