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"
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