const dHeight = Dimensions.get('window').height;
const dWidth = Dimensions.get('window').width;
const sHeight = Dimensions.get('screen').height;
const sWidth = Dimensions.get('screen').width;
状态栏高度：statusBarHeight
安卓底部虚拟导航条高度：botNavHeight
应用显示高度：aHeight
对于iOS：
dHeight = sHeight
dWidth = sWidth
dHeight = statusBarHeight + aHeight
对于安卓：
非全面屏：
dHeight = statusBarHeight + aHeight
sHeight = dHeight + botNavHeight
dWidth = sWidth
全面屏：
dHeight = aHeight
sHeight = statusBarHeight+ dHeight + botNavHeight
dWidth = sWidt
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