serialize()空值不要传

Question

<form>
    <div>
        <label for="realname">用户名</label>

        <div>
            <input name="username" id="realname" type="text">
        </div>
    </div>
    <div>
        <label for="branch">状态</label>

        <div>
            <select name="style" id="branch">
                <option value="">全部</option>
                <option value="false">正常</option>
                <option value="teue">禁用</option>
            </select>
        </div>
    </div>
    <div>
        <label for="role">角色</label>

        <div>
            <select name="role" id="role">
                <option value="">全部</option>
                <option value="1">学员</option>
                <option value="2">教练</option>
                <option value="3">管理员</option>
            </select>
        </div>
    </div>
    <div>
        <label for="power">购买课程</label>

        <div>
            <select id="power" name="paiclass">
                <option value="">全部</option>
                <option value="1">已购买</option>
                <option value="0">未购买</option>
            </select>
        </div>
    </div>
    <div>
        <button id="search">搜索</button>
    </div>
</form>

我使用serialize()进行传值，如果有某项的value="",那么这一项不传，请问怎么判断

Answer 1

判断什么？判断是空吗？