本文實(shí)例講述了JavaScript基于Dom操作實(shí)現(xiàn)查找、修改HTML元素的內(nèi)容及屬性的方法。分享給大家供大家參考，具體如下：
當(dāng)網(wǎng)頁被加載時，瀏覽器會創(chuàng)建頁面的文檔對象模型（Document Object Model）。HTML DOM 模型被構(gòu)造為對象的樹。
通過可編程的對象模型，JavaScript 獲得了足夠的能力來創(chuàng)建動態(tài)的 HTML。例如：改變HTML元素，改變HTML屬性，改變CSS樣式，事件響應(yīng)。
效果圖：
代碼：
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN""http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /><meta http-equiv="Content-Language" content="zh-cn" /><title>Javascript HTML DOM</title><head> <style type="text/css"> body {background-color:#eeeeee} </style></head><body> <h3>(一)通過 id 查找 HTML 元素</h3> <p id = "hw">Hello world!</p> <script> x = document.getElementById("hw"); document.write('<p>id="hw"的段落的文本是：'+x.innerHTML+'</p>'); </script> <button onclick = "setCurrentTime()">將id="hw"的文字改為當(dāng)前時間</button> <script> function setCurrentTime(){ x = document.getElementById("hw"); x.innerHTML = Date() } </script> <h3>(二)通過 標(biāo)簽名 查找 HTML 元素</h3> <div id = "mainDiv"> <p>This is a paragragph.</p> <p>This is another paragragph.</p> <p>Yes you're right! This is also paragragph.</p> </div> <script> xx = document.getElementById("mainDiv"); tagContents = xx.getElementsByTagName("p"); document.write("<p>使用Javascript查找id為mainDiv下的p標(biāo)簽的內(nèi)容</p>"); for(i=0;;i++){ var tag = tagContents[i] if(tag!=null){ document.write("<p>"+tag.innerHTML+"</p>") }else{ document.write("<p>共有"+i+"條內(nèi)容</p>") break; } } </script> <h3>(三)修改 HTML 的屬性</h3> <img id = "bol" src = "images/eg_bulboff.gif" width="70px" height="120px"/> <p><button onclick = "changeSrc()">改變圖片資源</button></p> <script> function changeSrc(){ x = document.getElementById("bol"); if (x.src.match("eg_bulboff.gif")){ x.src = "images/eg_bulbon.gif" }else{ x.src = "images/eg_bulboff.gif" } } </script> <h3>(四)修改 CSS 樣式</h3> <p> <span id = "para_1">This is a test paragraph.</span> <button onclick="changeTextColor()">改變文字顏色</button> </p> <p> <span id = "para_2">This is another paragraph. <button onclick="changeTextFont()">改變字體</button> </p> <p> <span id = "para_3">This is HELLO WORLD.</span> <button onclick="changeTextSize()">改變字號</button> </p> <p> <button onclick="changeVisibility()">顯示/隱藏</button> <span id = "para_4">示例文字</span> </p> <script> function changeTextColor(){ ele_1 = document.getElementById("para_1"); ele_1.style.color = "red"; } function changeTextFont(){ ele_2 = document.getElementById("para_2"); ele_2.style.fontFamily = "Arial"; } function changeTextSize(){ ele_3 = document.getElementById("para_3"); ele_3.style.fontSize = "larger"; } document.getElementById("para_4").style.visibility = "visible" function changeVisibility(){ ele_4 = document.getElementById("para_4"); if(ele_4.style.visibility.match("visible")){ ele_4.style.visibility = "hidden" }else{ ele_4.style.visibility = "visible" } } </script></body></html>更多關(guān)于JavaScript相關(guān)內(nèi)容感興趣的讀者可查看本站專題：《JavaScript事件相關(guān)操作與技巧大全》、《JavaScript操作DOM技巧總結(jié)》、《JavaScript錯誤與調(diào)試技巧總結(jié)》、《JavaScript數(shù)據(jù)結(jié)構(gòu)與算法技巧總結(jié)》、《JavaScript遍歷算法與技巧總結(jié)》及《JavaScript數(shù)學(xué)運(yùn)算用法總結(jié)》
希望本文所述對大家JavaScript程序設(shè)計(jì)有所幫助。
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