[問題] 透過javascript 更改data-*值
這是一個購物車的數量
<li class="cart" id='cart_div' data-cart="0"></li>
當我點選產品要加入購物車,想要透過js去變更data-cart的數值
我使用了_id('cart_div').dataset.cart可以抓到值
於是我想更改值 _id('cart_div').dataset.cart=2;
但畫面上數值並不會變動
網路上有人說用以下語法變更
_id('cart_div').getAttribute('data-cart','7');
也沒反應
想請各位大大指點指點,感恩
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