通过DOM树可以可容易的访问到html文档中的所有元素
例如向上访问父辈的元素有以下方法
1.parent()方法可以得到所定元素的直接父元素
$("span").parent();得到<span>元素的直接父元素
2.parents()方法得到给定元素的所有父元素
$("span").parents();得到<span>元素的所有父元素
$("span").panents(".text");得到<span>元素的父元素中class="text"的元素
3.parentsUntil()方法得到两个给定元素之间的元素
$("span").parentsUntil(".text");得到<span>元素与class="text"元素之间的所有元素
1 <!DOCTYPE html> 2 <html> 3 <head> 4 <meta charset="UTF-8"> 5 <script src="http://cdn.static.runoob.com/libs/jquery/1.10.2/jquery.min.js"> 6 </script> 7 <style> 8 .container 9 { 10 float:left; 11 margin-left:30px; 12 } 13 .container div 14 { 15 border:1px solid grey; 16 margin:15px auto; 17 } 18 .ancestor1-1,.ancestor2-1,.ancestor3-1,.ancestor4-1 19 { 20 width:150px; 21 height:150px; 22 } 23 .ancestor1-2,.ancestor2-2,.ancestor3-2,.ancestor4-2 24 { 25 width:120px; 26 height:120px; 27 } 28 .ancestor1-3,.ancestor2-3,.ancestor3-3,.ancestor4-3 29 { 30 width:90px; 31 height:90px; 32 } 33 .now1,.now2,.now3,.now4 34 { 35 width:60px; 36 height:60px; 37 } 38 </style> 39 <script> 40 $(document).ready(function(){ 41 $(".now1").parent().css("border-color","red"); 42 $(".now2").parents().css("border-color","red"); 43 $(".now3").parents(".ancestor3-2").css("border-color","red"); 44 $(".now4").parentsUntil(".ancestor4-1").css("border-color","red"); 45 } 46 ); 47 </script> 48 </head> 49 <body> 50 <div> 51 <div class="container"> 52 <div class="ancestor1-1"><div class="ancestor1-2"><div class="ancestor1-3"><div class="now1">给定元素</div></div></div></div> 53 </div> 54 <div class="container"> 55 <div class="ancestor2-1"><div class="ancestor2-2"><div class="ancestor2-3"><div class="now2">给定元素</div></div></div></div> 56 </div> 57 <div class="container"> 58 <div class="ancestor3-1"><div class="ancestor3-2"><div class="ancestor3-3"><div class="now3">给定元素</div></div></div></div> 59 </div> 60 <div class="container"> 61 <div class="ancestor4-1"><div class="ancestor4-2"><div class="ancestor4-3"><div class="now4">给定元素</div></div></div></div> 62 </div> 63 </div> 64 </body> 65 </html>
效果图：
