JavaScript

Summary:3 ways JavaScript is used:1, Page Script method2, inline event triggering3, External Introduction mode1, Page Script method1 2 3 4 5 Document 6 9 one -off 2, inline event triggering1 2 3 4 5 Document 6 7 8

JavaScript Regular Expressions 正则表达式Use to match a certain pattern in the string character combination of patterns, in the actual development of the use of frequency or relatively high, strong regular expression, can greatly facilitate our

12345678 the 94 theJavaScript variable Scope

operating Environment : the environment in which JavaScript code snippets are executed (can be understood as scopes in C/s + +)"Personal understanding" Variable Object : The first is an object that holds all the variables and functions of the

Advantages: In the process of asynchronous execution, the code that executes the code and the result is clearly separated (because the Promise object has a chained notation, then and catch) Combined with promise, many

var baiduusers = [], wechatusers = [];var User = function (ID, name, phone, gender, age, salary) {this.id = Id;this.name = Name;this.phone = Phone;this.gender = Gender;this.age = Age;this.salary = salary;}; User.create = function (ID, name, phone,

1, JS in the function of the overloaded: JS function, parameters are not required, a function hypothesis defines a few parameters, then the caller can pass, or can not pass, can also be only a two .... can also be transmitted a lot, so we can not

All the time, the code execution sequence for JavaScript, most people will think顺序执行var=function{ console.log(‘foo1‘);}foo(); // foo1var=function{ console.log(‘foo2‘);}foo();// foo2It all seems reasonable here, but it's not as simple as it

First, a simple understanding of JS typeof, will return six typesThat is, number string Boolen function object undefined is also six basic data typesThere are probably several types of display type conversions:　　Number () is converted to number type　

The use of regular expressions in program applications is very extensive.First the regular expression is generally written between two slashes:/Regular Expression/followed by two symbols ^ and $, the symbol ^ represents the beginning of a string,

Come in this morning to meet a bug like this:2 digits after the decimal point are not retained when the percentage is calculated, causing some results that cannot be divisible to be displayed too longAt first, I thought this was a very common bug,

JavaScript functions//code 1: ' Use strict ' function foo (x) {console.log (' x= ' + x); for (var i = 0; i 　　Functions of JavaScript

JavaScript design Pattern The 1th Chapter flexible Language--javascript The novice programmer receives a task that verifies the form function, needs to verify the user name, the mailbox, the password and so on * * The content of this

The prototype chain is the basis of JS object-oriented, very important. One, there are several ways to create objects: 1, literalvar o1 = { name:' O1 '};2, constructorvar function (name) { this. Name = name;}; var New M (' O2 ');var a = {} is

Tag: Start document path path var suffix src span declaration variableOne, the most basic one JS output1, JS writing environment:1) Internal Insert JS format: 2) External JS call format: 2. Output greetings to the world example: 　　Precautions * * *1)

operator to operate on one or more variables or values (operands) and return a new valueDepending on the operation performed, the operators can be divided into the following categories:(1) Arithmetic operators(2) Comparison operators

When exposed to Angulr.js and Vue.js, the most mentioned is two-way bindingThe following two-way binding of data is implemented with JavaScript JavaScript implements two-way binding of data

First, The history of JavaScript 1992 Nombas developed the embedded scripting language for C-minus-minus (c--) (originally bundled in Cenvi software). Rename it scriptease. (The language that the client executes) Netscape (Netscape)

1 DOCTYPE HTML>2 HTMLLang= "en">3 Head>4 MetaCharSet= "UTF-8">5 title>Documenttitle>6 style>7 Div{8 width:800px;9 margin:200px Auto;Ten Color:Orange; One text-align:Center; A Font:30px/30px "SimSun"; - } - style> the Head> -

1 DOCTYPE HTML>2 HTMLLang= "en">3 Head>4 MetaCharSet= "UTF-8">5 title>Documenttitle>6 Head>7 Body>8 Script>9 //concat (): Connect two strings to return a new string and will not be modifiedTen varstr1= "Hello"; One