《HTML文檔的結(jié)構(gòu)》PPT課件.ppt

《HTML文檔的結(jié)構(gòu)》PPT課件.ppt

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時間:2020-04-03

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1、本書編委會編著實例版第2章HTML文檔的結(jié)構(gòu)2.1HTML文檔的結(jié)構(gòu)2.2HTML基本語法2.3HTML文件的命名2.4編寫HTML文件的注意事項2.5小實例——插入圖片與表格2.6習(xí)題HTML/CSS/JavaScript標(biāo)準(zhǔn)教程實例版(第3版)2.1HTML文檔的結(jié)構(gòu)2.2HTML基本語法2.2.1標(biāo)記語法1、什么是標(biāo)記2、標(biāo)記類型和語法*單標(biāo)記*雙標(biāo)記實例什么是標(biāo)記HTML用于描述功能的符號稱為“標(biāo)記”。比如、、等,都是標(biāo)記,標(biāo)記表示HTML文檔的開始

2、。標(biāo)記在使用時必須用尖括號“<>”括起來,有些標(biāo)記必須成對出現(xiàn),以開頭無斜杠的標(biāo)記(如:)開始,以有斜杠的標(biāo)記(如:)結(jié)束。比如,

表示一個表格的開始,
表示一個表格的結(jié)束。在HTML中,標(biāo)記的大小寫作用相同,如和
都是表示一個表格的開始。返回單標(biāo)記之所以稱為“單標(biāo)記”,是因為它只需單獨使用就能完整地表達意思,這類標(biāo)記的語法是:<標(biāo)記名稱>最常用的單標(biāo)記是
,它表示換行。返回雙標(biāo)記“雙標(biāo)記”由“始標(biāo)記”和“尾標(biāo)記”兩部分構(gòu)

3、成,必須成對使用。?始標(biāo)記告訴Web瀏覽器從此處開始執(zhí)行該標(biāo)記所表示的功能。?尾標(biāo)記告訴Web瀏覽器在這里結(jié)束該功能。始標(biāo)記前加一個正斜杠(/)即成為尾標(biāo)記。這類標(biāo)記的語法是:<標(biāo)記>內(nèi)容其中“內(nèi)容”部分就是要被這對標(biāo)記施加作用的部分。返回2.2.1HTML基本語法實例效果2.2.1HTML基本語法實例返回2.2HTML基本語法2.2.2屬性語法1.什么是屬性2.屬性語法<標(biāo)記名字屬性1屬性2屬性3…>2.2.2屬性語法實例12.2.2屬性語法實例12.2.2屬性語法實例22.2.2屬性語法實例

4、22.3HTML文件的命名注意:?文件的擴展名要以.html或.html結(jié)束。?文件名中只可由英文字母、數(shù)字或下劃線組成。?文件名中不要包含特殊符號,比如空格、$等。?文件名是區(qū)分大小寫的,在Unix和Windows主機中有大小寫的不同。?網(wǎng)站首頁文件名默認(rèn)是index.htm或index.html。2.4編寫HTML文件的注意事項?所有標(biāo)記都要用尖括號(<>)括起來,這樣,瀏覽器就可以知道,尖括號內(nèi)的標(biāo)記是HTML命令。?對于成對出現(xiàn)的標(biāo)記,最好同時輸入起始標(biāo)記或結(jié)束標(biāo)記,以免忘記。?采用標(biāo)記嵌套的方式

5、可以為同一個信息應(yīng)用多個標(biāo)記,如下:同一個信息?在代碼中,不區(qū)分大小寫,比如,將寫成或都可以。?任何空格或回車在代碼中都無效,插入空格或回車有專用的標(biāo)記,分別是 、
。因此,不同的標(biāo)記間用回車鍵換行再編寫是個不錯的習(xí)慣。2.4編寫HTML文件的注意事項標(biāo)記中不要有空格,否則瀏覽器可能無法識別,比如不能將寫成<title>。下面的代碼中有誤,將該文件存為.html文件后,用瀏覽器打開,<tit</p><p>6、le>所定義的文字沒有在瀏覽器標(biāo)題中顯示,反而顯示在正文中,而錯誤的<title>標(biāo)記也被當(dāng)作正文來顯示。2.4編寫HTML文件的注意事項2.4編寫HTML文件的注意事項?標(biāo)記中的屬性,可以用雙引號("")引起來,也可以不引。比如,下面的寫法都是正確的:<hrcolor=red><hrcolor=”red”>2.5小實例——插入圖片與表格在<head></head>間定義頭部信息。2.5小實例——插入圖片與表格在<body></body>間寫兩段代碼,插入橫幅banner圖片和一段正文文字。2.5小實例—</p><p>7、—插入圖片與表格在<body></body>間輸入代碼2.5小實例——插入圖片與表格接上頁2.5小實例——插入圖片與表格接上頁2.5小實例——插入圖片與表格最終效果</p> </div> <div id="hm06gwt" class="mt-3 bg-white"> <div id="fspnuy4" class="d-lg-block d-none px-3 px-lg-4 py-3 border-bottom text-center font-18"> 當(dāng)前文檔最多預(yù)覽五頁,下載文檔查看全文 </div> <div id="i5emecc" class="detail-fixed-feature d-none d-lg-block" id="detailFixedFeatureBox"> <div id="mif4cbf" class="px-3 px-lg-4 py-3 d-flex align-items-center justify-content-between fixed-feature-box" id="detailFixedFeature"> <div id="vipv6j4" class="d-lg-flex d-none align-items-center"> <div> <a 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