前端20180503

原創 穆罕周 2020-06-21 09:29

1.判斷請求返回的圖片url是否使用了緩存圖片的方法

一．使用圖片的url在瀏覽器地址欄裏面打開，然後F12開發者工具查看Headers，如果裏面的Status Code是304就是使用了緩存圖片，不是從遠端獲取的

2.

解決url使用了瀏覽器緩存的問題，後臺返回的url不變（文件實際指向已經改變），瀏覽器就去去緩存圖片引起的，現在在返回的url後面加個“?時間戳”做hash值，欺騙瀏覽器每次都是請求不同的圖片

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