[請問] line的"已讀"顯示是什麼原理呢?
請問一下
a傳訊息給b 然後b打開對話視窗
這時候a就會出現"已讀"的字
這是什麼原理啊?
為什麼對方一開訊息視窗 a那邊就能知道已讀了?
或是能給我關鍵字來估狗一下原理嗎?
謝謝!!
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