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$(function(){ <!--点击登录弹出/隐藏登录框--> $("#loginin").click(function(){ $("#login").toggleClass("yinchang"); }); <!--鼠标离开登录框隐藏登录框--> $("#login").mouseleave(function(){ $("#login").toggleClass("yinchang"); }); }); <style> .yinchang{ display:none; } <style> <span class="btnlogin btndaxiao txtcenter text-jiacuda navlogin" id="loginin">登录</span> <div class="login-form box-dayuanjiao touming yinchang " id="login"> <form action="" method="post"> <p class="txtcenter text-jiacuda">用户登录</p> <div class="login-center"> <span class="icon">用户名:</span> <input class="" type="text" name="username" placeholder="用户名" /> </div> <div class="login-center"> <span class="icon">密码 :</span> <input class="" type="password" name="password" placeholder="*******" /> </div> <button class="btnlogin center txtcenter btndaxiao box-yuanjiao">登录</button> </form> </div>