获得DOM节点(重点)
DOM:文档对象模型
浏览器网页就是一个Dom树形结构
更新:更新DOM节点
遍历DOM节点:得到DOM节点
添加:添加一个新的节点
操作一个DOM节点,必须先获得DOM节点
获得DOM节点:
1 <!DOCTYPE html> 2 <html lang="en"> 3 <head> 4 <meta charset="UTF-8"> 5 <title>Title</title> 6 </head> 7 <body> 8 <div id="father"> 9 <h1>标题</h1> 10 <p id="p1">p1</p> 11 <p class="p2">p2</p> 12 </div> 13 14 15 16 <script> 17 //对应css选择器 18 var h1 = document.getElementsByTagName("h1"); 19 var p1 = document.getElementById(p1); 20 var p2 = document.getElementsByClassName(p2); 21 var father = document.getElementById("father"); 22 //father.children 获取父节点下的所有子节点 23 var childrens = father.children; 24 //father.firstChild 25 //father.lastChild 26 </script> 27 28 </body> 29 30 31 </html>