jQuery mouseup和不良行为

如果您使用click而不是mouseup (考虑到mousedown发生的位置)，它会按预期工作。

$(function () {
    var button = $('#loginButton');
    var box = $('#loginBox');
    var form = $('#loginForm');
    button.removeAttr('href');
    button.click(function (login) {
        box.toggle();
        button.toggleClass('active');
    });
    form.click(function (e) {
        if (e.target.id !== 'login'){
          e.stopPropagation();
          }
    });
    $(this).click(function (login) {
        if (!($(login.target).parent('#loginButton').length > 0)) {
            button.removeClass('active');
            box.hide();
        }
    });
});

#register {
    padding:5px 10px 5px 0;
    float: right;
}
/* Login Container */
 #loginContainer {
    float:right;
    margin-top: 10px;
}
/* Login, Logout Button */
 #loginButton, #logout {
    display:inline-block;
    float:right;
    background:#99cc66;
    border-radius:3px;
    -moz-border-radius:3px;
    position:relative;
    z-index:30;
    cursor:pointer;
}
#logout {
    color:#fff;
    height:32px;
    padding:5px 35px 5px 10px;
    background:#99cc66 url(../images/login-icon.png) no-repeat 62px 8px;
    display:block;
    border: 0;
}
/* Login Button Text */
 #loginButton span {
    color:#fff;
    padding:5px 35px 5px 10px;
    background:url(../images/login-icon.png) no-repeat 58px 8px;
    display:block
}
/* Login Box */
 #loginBox {
    position:absolute;
    top:38px;
    right:0;
    display:none;
    z-index:29;
}
/* If the Login Button has been clicked */
 #loginButton.active {
    border-radius:3px 3px 0 0;
}
/* Login Form */
 #loginForm {
    width:248px;
    border-radius:3px 0 3px 3px;
    -moz-border-radius:3px 0 3px 3px;
    margin-top:3px;
    background:#99cc66;
    padding:6px;
}
#loginForm fieldset {
    margin:0 0 12px 0;
    display:block;
    border:0;
    padding:0;
}
fieldset#body {
    background:#fff;
    border-radius:3px;
    -moz-border-radius:3px;
    padding:10px 13px;
    margin:0;
}
#loginForm #rememberMe {
    width:auto;
    margin:1px 9px 0 0;
    float:left;
    padding:0;
    border:0;
    *margin:-3px 9px 0 0;
    /* IE7 Fix */
}
#body label {
    color:#3a454d;
    margin:9px 0 0 0;
    display:block;
    float:left;
}
#loginForm #body fieldset label {
    display:block;
    float:none;
    margin:0 0 6px 0;
}
/* Default Input */
 #loginForm input {
    width:92%;
    border:1px solid #899caa;
    border-radius:3px;
    -moz-border-radius:3px;
    color:#3a454d;
    padding:8px 8px;
    box-shadow:inset 0px 1px 3px #bbb;
    -webkit-box-shadow:inset 0px 1px 3px #bbb;
    -moz-box-shadow:inset 0px 1px 3px #bbb;
    font-size:12px;
}
/* Sign In Button */
 #loginForm #login {
    width:auto;
    float:right;
    background-color:#339cdf;
    color:#fff;
    padding:7px 10px 8px 10px;
    text-shadow:0px -1px #278db8;
    border:1px solid #339cdf;
    box-shadow:none;
    -moz-box-shadow:none;
    -webkit-box-shadow:none;
    margin:0 16px 0 0;
    cursor:pointer;
    *padding:7px 2px 8px 2px;
    /* IE7 Fix */
}
/* Forgot your password */
 #loginForm span {
    text-align:center;
    display:block;
    padding:7px 0 4px 0;
}
#loginForm span a {
    color:#fff;
}
input:focus {
    outline:none;
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div id="loginContainer">
    <span id="loginButton"><span>log in</span></span>
    <div id="register"><a href="#">sign up</a> or:</div>
    <div id="loginBox">
        <form action="test" id="loginForm" method="post">
            <fieldset id="body">
                <input type="hidden" name="sAction" value="login" />
                <fieldset>
                    <label for="sUserId">username or email</label>
                    <input type="text" name="sUserId" id="sUserId" maxlength="255" />
                </fieldset>
                <fieldset>
                    <label for="sUserPassword">password</label>
                    <input type="password" name="sUserPassword" id="sUserPassword" maxlength="25" />
                </fieldset>
                <input type="submit" id="login" value="log in" />
            </fieldset>
        </form>
    </div>
</div>

注释后更新

在表单的click事件上返回false导致表单没有被提交。

所以我们需要把它改成

form.click(function (e) {
    if (e.target.id !== 'login'){
      e.stopPropagation();
      }
});