我有以下 HTML 代碼。如果我想<a>在單擊時選擇元素，為什么這不起作用？$('input[name="USR_NewPassword"] span > a').on('click', function(event) {  alert()});<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script><input type="password" name="USR_NewPassword" class="form-control" maxlength="50" required><span class="input-group-addon">        <a href=""><i class="fa fa-eye"></i></a>    </span>