JavaScript

JS is a weakly typed language1. When declaring a variable, you do not need to specify the data type stored by the variable2. Dynamically determine the type of data when assigning a valueThe same variable can hold different types of values

There are two ways to define a function: One is a function declaration and the other is a function expression .The grammar of the twoSyntax for function declarations:function functionname (arg0, arg1, arg2) { //body }Syntax for function

How to add tags dynamically to a document in your browser:I. Traditional methods: The following two types are HTML-specific properties that cannot be used in other markup language documents.1. document.write (): The biggest drawback is that it

New.target is a new ' magical ' value available in all functions, Thoughin normal functions It'll always be undefined. In any constructor,new.target all points at the constructor, that new actuallydirectly invoked.classParent {constructor () {if(New.

The internet era has created our new work and the way of life, its interconnection, openness and the sharing of information patterns, breaking the traditional way of information dissemination of the barriers, to bring us new opportunities. With the

1.JavaScript BooleanBoolean (logic) can have only two values: TRUE or FALSE.var x=truevar y=false2.JavaScript arraysvar cars=New Array (); cars[0]= "Audi"; cars[1]= "BMW"; cars[2]= "Volvo";or (condensed array):var cars=New Array ("Audi", "BMW",

11.1 A subset of JavaScript　　11.1.1 Essence　　Security of 11.1.2 subsets11.2 Constants and local variablesView Code11.3 Deconstruction AssignmentView Code11.4 iterations　　11.4.1 For/each CycleView Code　　11.4.2 iteratorsView Code　　11.4.3 GeneratorView

Way 1,splice123var ary = [1,2,3,4];Ary.splice (0,ary.length);Console.log (ary); Output [], empty array, is emptiedMethod 2,length is assigned a value of 0This is interesting, and other languages such as Java, whose array length is read-only, cannot

function LinkedList () {//helper class, which represents each of the added list's var node=function (element) {this.element=element; This.next=null; }//list, the length of the storage chain is Var length=0; var head=null;

Block the top right corner of the browser "minimize" "Maximize" "Close" keyOr use full screen to open the pageNote: Add onbeforeunload= "Javascript:return false" to the body tag//so that the window cannot be closedFive, shielding F5 keySix, block IE

Effect preview:Source Sharing:JavaCssHTMLJavaScript Front-end optimization Front-end development JavaCssHTMLJavaScript Front-end optimization Front-end development JavaCssHTMLJavaScript Front-end optimization Front-end development Original

The Substr function method in JavaScript is to return a substring of the specified length starting at the specified position. How to use:Stringvar.substr (start [, length])Where Stringvar is a required option. The string literal or string object to

Better understanding of the differences between node exports and module. exports, nodemodule. exports We only need to know the differences between exports and module. exports at three points: 1. exports is a reference to module. exports. 2. The

Summary of JavaScript knowledge points (11): Explanation of Object classes in js, javascriptobject The Object in JavaScript is the base class of all objects in JS. That is to say, all objects in JS are derived from Object objects. Object objects are

Jquery ezUI double-click the row record window to View Details. jqueryezui Step 1: bind the onDblClickRow event to the DataGrid; Step 2: Write a row double-click event // Double-click the event function onDblClickRow () {var item =$ ('# able able')

In-depth understanding of Ajax get and post requests and ajaxget 1. get request Function () {// request time to the server // 1. create an asynchronous object (small browser) var xhr = new XMLHttpRequest (); // 2. set the parameter. "true" indicates

Details about how JQuery binds events in a loop, and details about jquery There is a page that requires n dom, and each element ID in the DOM must end with a number, for example Now there is a loop. When loading a page, you need to add an

Summary of JavaScript method for determining whether a number is a prime number, javascript Prime Number Preface Today, I saw a question that makes it difficult to determine whether a number is a prime number. Therefore, I decided to implement

Simple implementation of js Continuous Rolling and js Continuous Rolling CSS: ul, li { margin: 0; padding: 0; } #scrollDiv { width: 300px; height: 25px; line-height: 25px; border-bottom: #4c8cd1 1px solid;

Share and optimize the Bubble Sorting Code implemented by javascript, and bubble the javascript Bubble Sorting: sorts the elements in an array in the ascending or ascending order. var array=[9,8,7,6,5,4,3,2,1]; The first round of comparison: 8, 7, 6,