1. 在canvas的style中动态设置高和宽
canvas class='canvas' style='width:{{canvasWidth}}px; height:{{canvasHeight}}px' disable-scroll='true' /canvas
2. 在.js生命周期函数中获取可使用窗口高度和宽度来调整canvas的高和宽
wx.getSystemInfo({ success: function(res) { myCanvasWidth = res.windowWidth - 56 myCanvasHeight = res.windowHeight - 200 }, }) this.setData({ canvasWidth: myCanvasWidth, canvasHeight: myCanvasHeight })
