What is JavaScript HTML DOM?
Through the HTML DOM, all elements of the JavaScript HTML document can be accessed.
HTML DOM (Document Object Model)
When a web page is loaded, the browser creates the Document Object Model of the page.
Through the programmable object model, JavaScript has gained enough power to create dynamic HTML.
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1.JavaScript HTML
HTML DOM allows JavaScript to change the content of HTML elements.
<!DOCTYPE html> <html> <head> <meta charset="utf-8"> </head> <body> <p id="p1">Hello World!</p> <script> document.getElementById("p1").innerHTML="新文本!"; </script> <p>以上段落通过脚本修改文本。</p> </body> </html>
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2.JavaScript HTML DOM - Change CSS
There are 4 ways to modify CSS in JavaScript:
Modify node style (inline style);
Change node class or id;
Write new css;
Replace the style sheet in the page.
<!DOCTYPE html> <html> <head> <meta charset="utf-8"> </head> <body> <h1 id="id1">我的标题 1</h1> <button type="button" onclick="document.getElementById('id1').style.color='red'"> 点我!</button> </body> </html>
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##3. JavaScript HTML DOM events
HTML DOM gives JavaScript the ability to react to HTML events.
<!DOCTYPE html> <html> <meta charset="utf-8"> <body> <p>点击按钮来执行 <b>displayDate()</b> 函数。</p> <button onclick="displayDate()">试一试</button> <script> function displayDate() { document.getElementById("demo").innerHTML=Date(); } </script> <p id="demo"></p> </body> </html>
Course link: http://www.php.cn/code/3752.html
4 .JavaScript HTML DOM EventListener
<!DOCTYPE html> <html> <meta charset="utf-8"> <body> <p>实例演示了在使用 addEventListener() 方法时如何传递参数。</p> <p>点击按钮执行计算。</p> <button id="myBtn">点我</button> <p id="demo"></p> <script> var p1 = 5; var p2 = 7; document.getElementById("myBtn").addEventListener("click", function() { myFunction(p1, p2); }); function myFunction(a, b) { var result = a * b; document.getElementById("demo").innerHTML = result; } </script> </body> </html>
http://www.php.cn/code/3755.html
5. JavaScript HTML DOM Elements
To add a new element to the HTML DOM, you must first create the element (element node) and then append the element to an existing element.
<!DOCTYPE html> <html> <meta charset="utf-8"> <body> <div id="div1"> <p id="p1">This is a paragraph.</p> <p id="p2">This is another paragraph.</p> </div> <script> var para=document.createElement("p"); var node=document.createTextNode("This is new."); para.appendChild(node); var element=document.getElementById("div1"); element.appendChild(para); </script> </body> </html>
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