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解決方法:將 操作系統與瀏覽器適配。
判斷操作系統和瀏覽器種類和版本,這個不難。
目前的主流平臺一共5個:
桌面平臺:
Windows(完美支持H5和 Flash Player)
Mac OS X(完美支持 H5和 Flash Player)
Linux(支持 H5,Flash Player支持到11.2,Chrome對 Flash Player 支持更好)
移動平臺:
Android(支持 H5,Adobe已經放棄Flash Player支持)
iOS(支持 H5, 不支持 Flash Player)
從上面可以看到,有半數以上的平臺(包括已經放棄支持的)支持 Flash Player。既然超過了半數,就有進行切換的需求與可能。
最完美的情況,就是檢測操作系統和瀏覽器版本,根據不同情況進行適配,例如:
Windows XP 系統,IE6瀏覽器,使用 Flash Player 來播放視頻;
Mac OS X 系統,使用 H5 來播放視頻;
移動平臺,必須使用 H5 ;
……
雖然在前端開發上有一定的成本(例如 Flash Player 和 H5 的界面適配、Desktop 和 Mobile 的界面適配,以及各種瀏覽器和平臺的組合之類的),但也不是不可承受。
解:sina^2+買粉絲sa^2=1
∴(sina+買粉絲sa)^2=sina^2+買粉絲sa^2+2sina買粉絲sa=1+(2/5)*2=9/5
又√買粉絲s>0
∴-買粉絲sa>0,從而買粉絲sa<0
1)若sina>0,則-1<sina+買粉絲sa<1
∴此時sina+買粉絲sa)^2<1<9/5(舍)
2)若sina<0,此時sina+買粉絲sa<0
∴sina+買粉絲sa=(3√5)/5