如何获取dom 的子节点并给样式

Question

<div class="menu-m-content-list-item showChild">
    <div class="menu-m-content-list-item-title">
        <p>xxxx</p>
        <img src="../../images/mobile/down.png" alt="">
    </div>
</div>


const showChildList = document.querySelectorAll('.showChild');
if (showChildList && showChildList.length > 0) {
    for (let i = 0; i < showChildList.length; i++) {
        const item = showChildList[i];
        item.onclick = function() {
           ......style.transform = 'rotate(180deg)';//想给子节点的img一个样式,请问怎么选择这个dom
        }
    }
}

Answer 1

img = item. querySelector("img");
img. style. xxx = xxxx;

Answer 2

item.querySelector('img')