javascript基础--DOM选取子节点
Posted Mr_W
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一、节点选取
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Document</title> <script> // 首尾子节点有兼容性问题 // firstChild firstElementChild // lastChild lastElementChild // 兄弟节点 // nextSlibing nextElementChild // previousSibling previousElementsSibling window.onload = function() { var oLi = document.getElementById(‘li1‘); var oPre = oLi.previousElementSibling || oLi.previousSibling; oPre.style.background = "red"; } </script> </head> <body> <ul id="ul1"> <li></li> <li id="li1"></li> <li></li> </ul> </body> </html>
二、dom节点childNodes和nodeType
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Document</title> <script> window.onload = function() { var oUl = document.getElementById(‘ul1‘); // alert(oUl.childNodes[1].nodeType); var i = 0; for (i = 0; i < oUl.childNodes.length; i++) { if (oUl.childNodes[i].nodeType == 1) { //1是指标签节点 3是指文本节点 oUl.childNodes[i].style.background = ‘red‘; } } } </script> </head> <body> <ul id="ul1"> <li>111</li> <li>222</li> <li>333</li> </ul> </body> </html>
三、children是没有兼容问题的childNodes
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Document</title> <script> window.onload = function() { var oUl = document.getElementById(‘ul1‘); // alert(oUl.children.length); var i = 0; for (i = 0; i < oUl.children.length; i++) { oUl.children[i].style.background = ‘red‘; } } </script> </head> <body> <ul id="ul1"> <li>111</li> <li>222</li> <li>333</li> </ul> </body> </html>
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