标签：class com length 内容 set 段落 mic round 开发
<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>菜鸟教程(runoob.com)</title> </head> <body> <h2>JavaScript HTML DOM</h2> <p>Hello World!</p> <p>Hello Runoob!</p> <p id="demo"></p> <script> var myCollection = document.getElementsByTagName("p"); document.getElementById("demo").innerHTML = "第二个段落的内容为:<span style=‘color:red;‘> " + myCollection[1].innerHTML + ‘</span>‘; </script> </body> </html>
<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>菜鸟教程(runoob.com)</title> </head> <body> <h2>JavaScript HTML DOM</h2> <p>Hello World!</p> <p>Hello Runoob!</p> <p id="demo"></p> <script> var myCollection = document.getElementsByTagName("p"); document.getElementById("demo").innerHTML = "文档包含" + myCollection.length + " 个段落。"; </script> </body> </html>
<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>菜鸟教程(runoob.com)</title> </head> <body> <h2>JavaScript HTML DOM</h2> <p>Hello World!</p> <p>Hello Runoob!</p> <p>点击按钮修改 p 元素的背景颜色。</p> <button onclick="myFunction()">点我</button> <script> function myFunction() { var myCollection = document.getElementsByTagName("p"); var i; for (i = 0; i < myCollection.length; i++) { myCollection[i].style.color = "red"; } } </script> </body> </html>
吴裕雄--天生自然 JAVASCRIPT开发学习：HTML DOM 集合(Collection)
标签：class com length 内容 set 段落 mic round 开发
原文地址：https://www.cnblogs.com/tszr/p/10944353.html
