<div id="div1">AAA</div> <div id="div2">BBB</div> <div id="div3">CCC</div>
根据标签选择, 如: $("span") <div><span>AAA</span></div> <div>BBB</div> <span>CCC</span>
根据样式的类名选择, 如: $(".class1") <div class="class1">AAA</div> <div class="class2">BBB</div> <div class="class1">CCC</div>
选择所有对象是: $("*") 可混合使用, 如: $("#btn2, .class1, span") [ ] <!doctype html> <html> <head> <script src="http://code.jquery.com/jquery-1.4.2.min.js"></script> </head> <body> <span>span1</span> <div> <button id="btn1">button1</button><br/> <button id="btn2">button2</button><br/> </div> <div> <label class="class1">label1</label><br/> <label class="class2">label2</label><br/> </div> <span>span2</span> </body> </html> <script> //修改选择对象的 color 样式为 red $("#btn2, .class1, span").css("color", "red"); </script>
可分层选择, 如: $(".class1 div label")
<div class="class1"> <div id="id1">111</div> <div id="id2"><span>222</span></div> <div id="id3"> <label>333</label></div> <span>444</span><br/> <span>555</span> </div>
如: $(".class1 span") 或 $(".class1").find("span") <div class="class1"> <div id="id1">111</div> <div id="id2"> <span>222</span></div> <div id="id3"><label>333</label></div> <span>444</span><br/> <span>555</span> </div>
只从子层中选择, 如: $(".class1 > span"); 如果没有中间的 > 会选择其下的所有符合条件的子孙对象 <div class="class1"> <div id="id1">111</div> <div id="id2"><span>222</span></div> <div id="id3"><label>333</label></div> <span>444</span><br/> <span>555</span> </div>
其后的, 如: $("div + span"); 这会选择所有紧跟在 div 后面的 span <div class="class1"> <div id="id1">111</div> <div id="id2"><span>222</span></div> <div id="id3"><label>333</label></div> <span>444</span><br/> <span>555</span> </div>
同一层级(后面)的, 如: $("#id2 ~ *"); 这是选择 #id2 后面同一层级的所有(*)对象 <div class="class1"> <div id="id1">111</div> <div id="id2"><span>222</span></div> <div id="id3"><label>333</label></div> <span>444</span><br/> <span>555</span> </div>
混合使用, 如: $("#id3 label, #id3 ~ span") <div class="class1"> <div id="id1">111</div> <div id="id2"><span>222</span></div> <div id="id3"> <label>333</label></div> <span>444</span><br/> <span>555</span> </div>
选择同一层级的其他元素, 如: $("#id2").siblings() <div class="class1"> <div id="id1">111</div> <div id="id2"><span>222</span></div> <div id="id3"><label>333</label></div> <span>444</span><br/> <span>555</span> </div>
选择同一层级的其他 span, 如: $("#id2").siblings("span") <div class="class1"> <div id="id1">111</div> <div id="id2"><span>222</span></div> <div id="id3"><label>333</label></div> <span>444</span><br/> <span>555</span> </div>