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下图左边是正常的, 右边是异常的
原因是该页面有2个计数元素,上方和中间, 下方通过contentElement.parentElement.querySelector(".counter"); 获取计数元素,
但下方(已安装列表)和上方(更新列表)两者是异步并发创建(fetch), 如果上面的先完成(因为下列表耗时),那么下方获取的计数元素将是上方的计数器,而不是中间的,
因此需要把 parentElement 改成了 previousElementSibling