JavaScript

JavaScript Basics Tutorial Arithmetic operators Operator Operator description Example Example description + Addition X+y If x is an integer 2,y is an integer 5, x+y equals 7If x is the string "Text1"

The Array.prototype.forEach () method lets each item of an array perform a given function once. -mdn Suppose there was such a scene that you got such an array of [{symbol: "XFX", price:240.22, volume:23432},{symbol: "TNZ", price:332.19, volume:234}

Learning to parse the JSON string today, using an eval () method, why do I need parentheses when parsing a string? I can't touch my head. The original JavaScript {} statement block is ambiguous, without parentheses there will be errors,

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Copy Code code as follows: The FileSize attribute of JavaScript and IMG itself under IE is applied. In addition, IMG has several other attributes, such as Filecreateddate, Filemodifieddate, FileSize, fileupdateddate, filters, we can

About Reverse References Copy Code code as follows: Test function function Matchreg (Reg, str) { var result = Str.match (reg); if (result) { Console.dir (result); } else { Console.log (' match failed '); } } var

Method definitionCall Method:Syntax: Call ([thisobj[,arg1[, arg2[, [,. argn]]]]Definition: Invokes one method of an object, replacing the current object with another object.DescriptionThe call method can be used to invoke a method instead of another

Hoisting mechanism The JavaScript variable declaration has a hoisting mechanism that, when executed, promotes the declaration of all variables to the front of the current scope. Read a piece of code first var v = "Hello"; (function () {

When it comes to setinterval, you have to mention settimeout, both of which are used to perform a function on a regular basis, the difference being that settimeout is executed only once, and setinterval can be executed continuously, typically as

1. About this object Copy Code code as follows: View Plaincopy to Clipboardprint? var obj1=new Object (); var obj2=new Object (); Add attribute p to all two objects, equal to 1 and 2 respectively Obj1.p=1; obj2.p=2;

1. Click event ___onclick The event that occurs when the user clicks the mouse button. The event handler or code specified by the onclick is invoked to execute. such as: 2. Change Event ___onchange Occurs when the character value within the text

Objective Replace the first argument generally places a regular expression that matches the text you want to replace, and the second argument, in general, we put in a string that replaces the text that is being matched. In fact, the replace is far

In the presence of such a variable TT, it satisfies the following code. After the code executes, errcount=0 and the assertion function never has alert information The code is as follows: Copy Code code as follows: Magic variables in

Let's take a look at the official explanation: Call method Please see Apply to: Function Object Requirements Version 5.5 Invokes one of the object's methods to replace the current object with another object. Call ([thisobj[,arg1[, arg2[, [,. argn]]]]

1.document.write (""); Output statement The annotation in 2.JS is// 3. Traditional HTML Document order is:document->html-> (head,body) 4. The DOM order in a browser window is:window-> (navigator,screen,history,location,document) 5. Get the name

Both simple and complex web applications are made up of HTML, JavaScript, and CSS files. Developers typically use a third-party JavaScript framework such as jquery, knockout, underscore, etc. to improve development speed. Because these JavaScript

Preface --speak in front I think there are a lot of beginner friends who used to have little access to the background programming language, like me, confused a series of "nouns" in JavaScript. Seems to know what to say, but the understanding is

There are three kinds of programming errors: (1) syntax errors and (2) Run-time error (3) logic errors:syntax error: Syntax errors, also known as parsing errors, are performed at compile time in a traditional programming language and appear in

The JavaScript date.setutcseconds () method specifies a date according to the universal Time set by seconds.Grammar Date.setutcseconds (secondsvalue[, Msvalue]) Note: The data inside and outside the brackets is optional The following

The JavaScript date.getyear () method returns the year of the specified date according to the Universal Time. GetYear is no longer in use and has been replaced with the getFullYear method. The value returned by GetYear is the current year minus 1900