演示-JQuery关系选择器
1 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> 2 <html xmlns="http://www.w3.org/1999/xhtml"> 3 <head> 4 <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> 5 <title>index</title> 6 <script type="text/javascript" src="jquery-3.1.1.min.js"> 7 8 </script> 9 <script type="text/javascript"> 10 $(function(){ 11 console.log("选择div后代元素中的a元素,其长度为:"+$("div a").length); 12 console.log("选择div子代元素中的a元素,其长度为:"+$("div>a").length); 13 console.log("选择紧接div的子元素中的a元素,其长度为:"+$("div+a").length); 14 console.log("选择div同代元素中的a元素,其长度为:"+$("div~a").length); 15 } 16 ); 17 </script> 18 </head> 19 <body> 20 <div> 21 <p>hello world!</p> 22 </div> 23 <div class="test" id="test" align="" style="background-color:#CCCCCC"> 24 <div> 25 <a href="http://www.cnblogs.com/yw0219/p/5928955.html">JQuery选择器</a> 26 <p><a href="http://www.cnblogs.com/yw0219/p/5928955.html">JQuery选择器</a></p> 27 </div> 28 <a href="http://www.cnblogs.com/yw0219/p/5928955.html">JQuery选择器</a> 29 </div> 30 </body> 31 </html>
结果:
God, Grant me the SERENITY, to accept the things I cannot change,
COURAGE to change the things I can, and the WISDOM to know the difference.