方法一
onLoad: function () {
this.setData({
height: wx.getSystemInfoSync().windowHeight,
width: wx.getSystemInfoSync().windowWidth
})
}方法二
.index{
height: 100vh;
width: 100vw;
}
# CSS3引入的"vw"和"vh"基于宽度/高度相对于窗口大小
# "vw" = "view width" "vh" = "view height"