JavaScript

>>>js Basic KnowledgeFirst, JS role1, form verification, reduce the pressure on the service side;2. Add a page animation effect3. Dynamically change the content of the page※4, Ajax network requestsII. Basic StructureThree, three ways to use JS1,

BOM operation one, what is a BOMBOM (Browser object model)The BOM provides an object that is independent of the content and interacts with the browser window;A BOM is composed of a series of related objects, and each object provides many methods and

There are three types 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

Object method to invoke a variable to call the Display object belongs to the name, you can do thisvar person = { Borther1: {name: "Tom"}, Borther2: {name: "Jack"}, Borther3: {name: "David"}, Saybort

1. Data typeThere are 7 data types in JS6 of these are basic types including null, Undefined, Boolean, number, string and symbol, and a reference type ObjectBut when judging the data type, you can use typeof except for null1. NullHow should null be

70331833var json1 = [{"Guoshui": [300000, 500000, 600000, 800000, 1000000, 1200000, 1400000, 1600000, 1800000, 1600000, 1400000, 12 00000]},{"Dishui": [1100000, 1200100, 1300000, 1100000, 1050000, 1400000, 1200000, 1600000, 1800000, 1200000, 1400000,

Career development, code 100 days--2018-04-21Today, the JavaScript is used to manipulate table tables, including the acquisition of table elements, creation, deletion, and so on.An ordinary complete form consists of the following sections:

(1) What is the difference between what is a formal parameter in a JS function and what is an argument? Parameters are called parameter variables, and the variables received by the function in JS are divided into formal parameters and arguments. An

Event bubbling: When an event on an element is triggered, such as a mouse click on a button, the same event will be triggered in all ancestors of that element, a process known as event bubbling. This event starts from the original ancestor and

1, about function parameter--es6 new characteristic restRest saves the parameters of the function in an array-like way function Eledis (... rest) { for (var i=0;i ) { alert (rest[i]); } } Eledis (1,2,[3,4,5]);The

Career development, code 100 days--2018-04-12There are two types of timers in JavaScript, namely SetInterval and settimeout, which are used as follows:Open:SetTimeout ("function", time) sets a timeout object, delays execution, and executes only

1 DOCTYPE HTML>2 HTMLLang= "en">3 Head>4 MetaCharSet= "UTF-8">5 title>Documenttitle>6 style>7 Div{8 width:1210px;9 margin:200px Auto;Ten Color:Orange; One text-align:Center; A Font:30px/30px "SimSun"; - } - style> the Head> -

Recursive method to generate JSON tree data var getjsontree = function (data, parentid) { var itemarr = []; for (var i = 0; i JavaScript recursive method for generating JSON tree structure data

Recursive method to generate JSON tree data var getjsontree = function (data, parentid) { var itemarr = []; for (var i = 0; i JavaScript recursive method for generating JSON tree structure data

DOCTYPE HTML>HTML> Head> MetaCharSet= "UTF-8"> title>title> Head> Body> pops the value of the selected radio box - inputtype= "button"name=""ID=""value= "Choose the male choice female?" "onclick= "Danxuan ()" />

Transferred from: https://www.cnblogs.com/pssp/p/5216085.htmlExample 1:function A () { var user = "Chasing the Dream"; Console.log (This.user); Undefined console.log (this);//window}a ();As we said above, this finally points to the object

Math ObjectThe Math object is used to perform mathematical tasks.The Math object is not a class of objects like Date and String, so there is no constructor for math ().Common methods of Mathvar n1=1234;var n2=12.34;var n3=56.78;var n4=12.34;1 var n5=

The pits in the values:1. Inside JavaScript, all numbers are stored as 64-bit floating-point number, even if the integer is the same. So 1 and 1.0 are the same number, and there are no integers at all in the JavaScript language bottom. However,

First, the conceptA callback function, or callback, refers to a piece of executable code that passes through a function parameter to another code. This design allows the underlying code to invoke subroutines defined at the top level.At first glance,

Singleton mode: Ensures that a class can only be instantiated once.var obj = {}2, function return value var func = function () {return {}}var obj = func (); 3, constructor initialize var obj = (function () {return {}}) () Decorator mode: An