Simple summary of JS knowledge points

JS (JavaScript) is a kind of explanatory language

is weak / dynamic

The first to use for form validation

Five parts of JS:

1. Core language Definitions

2. native objects and built-in objects

5boolean

3.BOM

4.DOM

5. Event-Handling model

Data type

1.Undefined

2.Number

3.Object

4.String

When the function has no explicit return value, the value returned is undefined

the single and double quotes in JS are not very different, they are all strings.

BOM: Browser Object model

The top level window

The size of the page can be obtained by DOM to operate

SetTimeout ()// execute only once

SetInterval ()//Dead loop

Document.images// get a collection of all pictures

window.location//Address bar

Window.history//historical record

Window.history.go (-1)//return to upper level

Window.navigator//Get the version of the operating system

Dom

Document

API a set of functions / Properties

Document Object Model

document.getElementById ();

InnerHTML (); (select/table cannot be used directly )

Node

InnerText ();

Text

Document.childnodes child Nodes [ including element nodes and text nodes ]//contains text in addition to standard elements

Event

Definition : Interaction between user and page

Handling of events

1. Traditional : Assignment Operation , The original does not exist
2. Now : add to the inside ( Disadvantage browser problem )

Event classification

1. Mouse

MouseDown, MouseUp, MouseOver, mouseout

1. Keyboard

KeyDown, KeyPress, KeyUp

1. Html

Load, focus, blur, change, select

This event

This pass value

Event occurrence itself, low version IE (window.event)

Application section

1. Control style

Background-color = = = BackgroundColor

Document.body.style.backgroundColor

Document.body.className

1. Regular expressions

/^ Start $ end/

1. *: Matches 0 to N characters
2. +:1 to N characters
3. ?: 0 to 1
4. {} scope
5. [789] can be 7 for 8 9,[m-n] range

\. Enter a decimal point

Regular Expressions: Inefficient execution

Jquery

$===jquery

GT () In addition to the above

<form action= "" method= "Post/get" ></form>

Post submissions are not displayed in the navigation bar

Get submissions are displayed in the navigation bar above

JS get form

1. document.getElementById ();
2. Document.getelementsbynames () [];
3. document.getElementsByTagName () [];
4. document.forms[0]/document.forms[]
5. Document.
6. Document.body.childNodes then uses the loop to determine whether the form element

JQuery get form

1. $ (ID);
2. $ (Class:eq ());
3. $ ("from"). EQ ();
4. $ ("action=": eq () ")

Input Type Property

1. Text
2. Botton
3. File
4. Radio
5. Password
6. Hidden
7. Submit
8. Reset
9. Checkbox
10. Image

Select

Textarea

Jquery-ui

Simple summary of JS knowledge points