html:<ul id="bursh-weight-option"> ? ?<li><div class="bw bw1" data-w='1'></div></li> ? ?<li><div class="bw bw5" data-w='5'></div></li> ? ?<li><div class="bw bw10" data-w='10'></div></li> ? ?<li><div class="bw bw20" data-w='20'></div></li> ? ?<li><div class="bw bw40" data-w='40'></div></li></ul>JS:$('#bursh-weight-option li').click(function(){ ? ?$('#bursh-weight-option').toggleClass('show');});css:#bursh-weight-select ul.show{ ? ? ?? ? ?display: block;}//這里為什么不能直接寫成這樣.show{ ? ? ??? ?display: block;}