lazada-sort-by-sold.js

const productContainer = document.querySelector('div[data-qa-locator="general-products"]');

const sortedEls = Array.from(productContainer.children)
    .flatMap(product => {
        const salesInfo = product.querySelector('._1cEkb');
        if (!salesInfo) return [];

        const salesText = salesInfo.innerText;
        const [soldStr] = salesText.split(' ')
        const salesCount = parseInt(soldStr.replace(",", ""));
        return [{ productElement: product, salesCount }];
    })
    .sort((a, b) => b.salesCount - a.salesCount)
    .map(x => x.productElement);

productContainer.innerHTML = "";
for (const el of sortedEls) {
    productContainer.appendChild(el);
}