Javascript 当其他类不存在时Jquery addclass

我有以下Div结构

<div class="product-layout">
    <div class="product-item-container">
        <div class="left-block">
            <div class="product-image-container">TitleGoesHere</div>
        </div>
        <div class="right-block">
            
            <div class="description">
                <p>ContentGoesHere </p>
            </div>
        </div>
        <div class="list-block"><button class="addToCart btn-button" type="button" title="Add to cart" onclick="cart.add('55', '1');"><i class="fa fa-shopping-basket"></i></button><button class="wishlist btn-button" type="button" title="wishlist" onclick="wishlist.add('55');"><i class="fa fa-heart"></i></button></div>
    </div>
</div>
<div class="product-layout product-grid">
    <div class="product-item-container">
        <div class="left-block">
            <div class="product-image-container">TitleGoesHere</div>
        </div>
        <div class="right-block">
            
            <div class="description">
                <p>ContentGoesHere </p>
            </div>
        </div>
        <div class="list-block"><button class="addToCart btn-button" type="button" title="Add to cart" onclick="cart.add('55', '1');"><i class="fa fa-shopping-basket"></i></button><button class="wishlist btn-button" type="button" title="wishlist" onclick="wishlist.add('55');"><i class="fa fa-heart"></i></button></div>
    </div>
</div>

尝试使用

：not（）

选择器

$（'.产品布局：非（.product list，.product grid））.addClass（'product-list'）

产品列表{颜色：红色；}

A.
b

<div class="product-layout product-list">

<div class="product-layout product-grid">

<div class="product-layout product-list">

 if(!$(".product-layout").hasClass("product-list") || !$(".product-layout").hasClass("product-grid")){
    $(".product-layout").addClass("product-list");
 }