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ReactNative移動開發(fā)技術(shù)

HTML,CSS,Javascript基礎(chǔ)

本節(jié)內(nèi)容

HTML基礎(chǔ)

CSS與Flexbox基礎(chǔ)

Javascript基礎(chǔ)與JSX、Babel

HTML基礎(chǔ)

HTMLstandsforHyperTextMarkupLanguage

HTMLdescribesthestructureofWebpagesusingmarkup

HTMLelementsarethebuildingblocksofHTMLpages

HTMLelementsarerepresentedbytags

HTMLtagslabelpiecesofcontentsuchas"heading","paragraph","table",andsoon

BrowsersdonotdisytheHTMLtags,butusethemtorenderthecontentofthepage

Example

The<!DOCTYPEhtml>declarationdefinesthistobeHTML5

The<html>elementistherootelementofanHTMLpage

The<head>elementcontainsmetainformationaboutthe

The<title>elementspecifiesatitleforthe

The<body>elementcontainsthevisiblepagecontent

The<h1>elementdefinesalargeheading

The<p>elementdefinesaparagraph

Example

HTML基礎(chǔ)

HTML5(2014至今)

Semantics:allowingyoutodescribemorepreciselywhatyourcontentis.

Connectivity:allowingyoutocommunicatewiththeserverinnewandinnovativeways.

Offlineandstorage:allowingwgestostoredataonthe -sidelocally

offlinemoreefficiently.

Multimedia:making andaudiofirst-classcitizensintheOpenWeb.

2D/3Dgraphicsandeffects:allowingamuchmorediverserangeofpresentationoptions.

Performanceandintegration:providinggreaterspeedoptimizationandbetter

computerhardware.

Deviceaccess:allowingfortheusageofvariousinputandoutputdevices.

Styling:lettingauthorswritemoresophisticatedthemes.

CSS與Flexbox基礎(chǔ)

CSSstandsforCascadingStyleSheets

CSSdescribeshowHTMLelementsaretobedisyedonscreen,paper,orinothermedia

CSSsavesalotofwork.Itcancontrolthelayoutofmultiplewebpagesallatonce

ExternalstylesheetsarestoredinCSSfiles

Example

Thebody,h1,parethedescribedHTMLelements.

Thebackground-colorpropertyspecifiesthebackgroundcolorofanelement.

Thecolorpropertyisusedtosetthecolorofthetext.

Thetext-alignpropertyisusedtosetthehorizontalalignmentofatext.

Thefont-familypropertyisthefontfamilyset f t t

Thefont-sizepropertysetsthesizeofthetext.

CSS與Flexbox基礎(chǔ)

Flexbox

Flexibleboxes,orflexbox,isanewlayoutmodeinCSS3.

Useofflexboxensuresthatelementsbehavepredictablywhenthepagelayo

modatedifferentscreensizesanddifferentdisydevices.

Aflexcontainerexpandsitemstofillavailablespace,orshrinksthemtopreventoverflow.

CSS與Flexbox基礎(chǔ)

Flexboxexamples

Theflexpropertyspecifiesthelengthoftheflexitem,relativetotherestofthe

thesamecontainer,example.

Theorderpropertyspecifiestheorderofaflexibleitemrelativetotherestoft

insidethesamecontainer,example.

Thejustify-contentpropertyhorizontallyalignstheflexiblecontainer'sitemsw

notuseallavailablespaceonthemain-axis,example.

Thealign-itemspropertyverticallyalignstheflexiblecontainer'sitemswhenth

useallavailablespaceonthecross-axis,example.

Thealign-selfpropertyofflexitemsoverridestheflexcontainer'salign-itemsp

item,example.

Javascript基礎(chǔ)與JSX，Babel

JavaScriptisafull-fledgeddynamicprogramminglanguagethat,whenappliedtoanHTML,canprovidedynamicinctivityonwebsites.

ItwasinventedbyBrendanEich,co-founderoftheMozillaproject,theMozillaFoundation,andtheMozillaCorporation.

Javascript基礎(chǔ)與JSX，Babel

Examples

Thisexampleusesthemethodto"find"anHTMLelement(withid="demo")an

elementcontent(innerHTML)to"oJavaScript"

ThisexamplechangesanHTMLimagebychangingthesrc(source)attributeofan<img>tag.

ThisexamplechangesthestyleofanHTMLelement,isavariantofchanging

attribute.

ThisexampleusesJavascripttohideHTMLelementscanbedonebychangi

style.

Javascript基礎(chǔ)與JSX，Babel

JSX

JSXisaXML-likesyntaxextensiontoJavaScript.

It'sintendedtobeusedbyvariouspreprocessors(t

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