LocalStorage删除具有特定值的项目

Question

我正在尝试从localStorage数组中删除一个值。我要删除的值是30

localStorage值：["70","30"]

var items = JSON.parse(localStorage["favorite"]);
for (var i =0; i< items.length; i++) {
    var item = JSON.parse(items[i]);
    if (item == 30) {
      items.slice(i);
      break;
    }
}

localStorage.setItem("favorite", items);