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Basic javascript syntax learning notes, javascript learning notes I. DefinitionJavascript is a scripting language (interpreted Programming Language) used to enhance the dynamic page effect and realize real-time and dynamic interaction between pages and users ). Javascript co
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the $b is assigned to the $b at this time, which is 1. var // s_007 is a string var true // answer is a Boolean value of True var NULL // The value of T is nullUse equals = To assign, and can be assigned multiple times (even to different types), but only once with Var.var // the value of A is an integer 123 // a becomes a stringThis type of variable itself is called Dynamic language, which corresponds to static language. Static languages must specify the variable type when defining the variable
Basic Syntax of JavaScript learning notes and javascript learning notes Many basic content in JavaScript is basically the same as that in Java, so you do not need to repeat it separately, including: Various Arithmetic Operators, comparison operators, and logical operators; I
Javascript learning notes _ basic syntax, type, variable, and javascript learning notes Basic syntax, type, and variable Non-numeric values: (since Infinity and NaN are not equal to any value, including themselves) 1. Use x! = X. true is returned only when x is NaN; 2. isNaN (x) is used. If x is NaN or a non-numeric va
Basic Javascript learning notes (for cainiao) and javascript learning notes What is a variable? A variable is a container used to store information. Variable Declaration Syntax: Var variable name Variable name = value; The variable must be declared before being assigned a value. Variable values can be assigned repeated
Document directory I. What is JavaScript? Ii. Start of JavaScript programming Iii. Implementation basics of JavaScript Iv. Summary of this Chapter From the beginning of college, I began to learn how to create web pages and began to access Javascript. Now I just feel that Ja
JavaScript Learning Guide NotesFirst chapter Hello javascript!Introduction to JavaScript JavaScript belongs to the scripting language on the network side . JavaScript is used by millions of of pages to improve design,
Javascript Learning Guide, javascript authoritative guide It is too easy to get started with javascript, so that almost everyone can get started with it by looking at it at will. People with no foundation can claim that they have mastered javascript For three or five days. B
Java programmer's JavaScript learning notes (1-concept) and javascript learning notes We plan to complete this note in the following order: Each article may have a few words or a long story. Short may be because the concepts are hard to understand and need to be digested slowly. Long may be because there is too much c
Beginner quick learning JavaScript free tutorial resource Summary This article describes how to quickly learn JavaScript free tutorial resources for beginners. It is a very good learning site. If you need it, you can refer to it. JavaScr
JavaScript self-learning notes (required) and javascript self-learning 0-determine whether variables and parameters are initialized If (x) {} // The variable is initialized, the variable is not empty, or the variable is not zero. 1-declaring a function does not need to declare the return value, parameter type, or end o
Javascript learning notes (1) Basic knowledge and javascript learning notes Basic Concepts Javascript is an interpreted language, and the browser acts as an interpreter. The js execution engine does not execute a row or a row, but analyzes and executes a row or a row. Delaye
available) andAvailheight (the available screen height).Screen Object properties:Instance:document.write ("Usable width:" + screen.availwidth+ ",");d ocument.write ("Available height:" + screen.availheight);Output: Available width: 1366, available height: 728Four History objectsThe history object is a record of keeping the internet, counting from the moment the window is opened, including the browser. In order to protect the privacy of users,JavaScript
JavaScript learning notes: JS event objects and javascript learning notes Event object: when an event occurs, the browser automatically creates the object, including the event type and mouse coordinates. Attribute of the event object: Format: event. attribute. Notes: Event indicates the event status, such as the elemen
JavaScript learning notes timer and javascript learning notes Timer 1 It is used to execute a program after a specific period of time. SetTimeout (): Format: [Timer object name =] setTimeout (" Function: Run Example: Copy codeThe Code is as follows: Timer 2 The expressions are repeatedly executed at intervals. SetInte
JavaScript learning notes _ about expressions and statements, javascript learning notes Expressions and statements Eval () has only one parameter If the parameter is not a string, this parameter is directly returned; When the parameter is a string, it uses the string as JavaScript
Learning javascript object-oriented understanding of javascript prototype and prototype chain, javascript object-oriented Let's take a look at a picture and sort it out. I. Basic Concepts Prototype chain]Each constructor has an object. The prototype object contains a pointer to the constructor, And the instance contai
the time variable name to specify it. It can be written like this:Cleartimeout (time);So let's say a few examples below:Example one: simple timingThe result of the operation is:Example two: Another simple timingThe result of the operation is:Example three: An infinite loop of timed eventsClick on the result of the Start Timer button:Example four: Timing events in an infinite loop with a stop buttonClick the result of the start timer:Click the result of the stop timing:Example five: Clocks made
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