JavaScript

1. First look at an example:As can be seen, obj1 copied the value of obj, but only the address reference, modify the value of OBJ1 also affect the value of obj, did not create a new object.Shallow copy: A value pass on the base data type , and a

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

Method of Event bindingDiv.onclick = function () {}//function this points to Div-----------------------------------------------Obj.addeventlistener (Type,fn,false) IE9 The following is incompatible, you can bind multiple handlers for an event the

The way to have multiple first arrays in JavaScript Three different implementations are implemented in the same way JavaScript: Multiple ways to define arrays

Background:Recently, the company's products often encounter date scheduling similar functions;The scheduling dates for the requirements vary: some are two weeks, some are four weeks, there is a status of active when the check is selected, and a hook

2.1 What is an eventUsually the action of a mouse or hotkey is called an event, and the action of a sequence of programs triggered by a mouse or hotkey is called event-driven. Handlers or functions for events, which we call event handlers.2.2 Event

1 gives an array that sorts the array from small to large.Thought Analysis: (1) nested another for loop nested an If statement to achieve the purpose(2) Outer for loop control changes from 0 bits to maximum bit(3) The inner for Loop controls the

Https://www.cnblogs.com/wl0000-03/p/6050108.html1. anonymous functionA function is the most flexible object in JavaScript, and this is just about the purpose of its anonymous function. anonymous function: is a function that has no function name.1.1

1, Ajax short Connection: Every second the client sends a request, the server receives the request will immediately return the result, regardless of whether there is no new data.2, Ajax long connection: The client sends a request, the server

1.JavaScript does not have the int, double in Java and C, how to recognize these types? or not supported.Q: What do you think?Answer: VAR supports all data types (int, double, string), depending on the value you enterYes, it's supported.Yo, you

recursive function: refers to the function directly or indirectly called the function itself, it is said that the function is a recursive function.This sentence is not difficult to understand, from a conceptual point of view, give the following

1. ArraysThe array type is a very common type. Although like arrays in other languages are an ordered list of data, arrays in ECMAScript are quite different. First, the array in the ECMAScript can hold any type of data (strings, numbers, objects,

JavaScript is an object-oriented, dynamic language that contains types, operators, standard built-in (built-in) objects, and methods. Its syntax comes from Java and C, so many of the syntax features of the two languages apply to JavaScript as well.

JavaScript Advanced Programming: Event Delegation is the use of event bubbling, specifying only one event handler, you can manage all events of a certain type. Using Event delegation techniques allows you to avoid adding event listeners to a

Common functionsHere's the normal function.function add(x, y) { return x + y;}Each normal function is called when it is equivalent to having a this parameter passed in.The intrinsic function This is not an external function that is passed in this,

First, JavaScript overviewJavaScript is a scripting language based on objects and events.Characteristics:1. Security (does not allow direct access to the local hard disk (because it is interpreted by a remote browser), it can do is the dynamic

Digital:function isNumber(val){if((typeof(val)==‘number‘)||(val instanceof Number)){ return true}else{ return false}}String:function isString(val){if((typeof(val)==‘string‘)||(val instanceof String)){ return true}else{ return

First, conditional control statements1. IfScripttype= "Text/javascript"> varNum= 1 if(Num== 3) {alert ("1"); } Else if(Num== 2) {alert ("2"); } Else if(Num== 1) {alert ("1"); } Else{alert ("0"); }Script>2. SwitchGetting Started

In js_html_input, autocomplete = "off" is invalid in chrom. autocompletechrom There are two ways to share the Internet: 1-you can set autocomplete = "new-password" in the input box that does not need to be filled by default (tested, valid) I did

Example of cache Algorithm Implementation in JS (FIFO/LRU), fifolru FIFO The simplest caching algorithm is to set the upper limit of the cache. When the upper limit of the cache is reached, it is eliminated according to the first-in-first-out policy