小程序canvas中drawImage自適應寬度鋪滿屏幕

在微信小程序創建畫布並且自適應屏幕寬度鋪滿屏幕 wxml先創建一個畫布 <view class='page'> <button bindtap='click' type='primary' size='mini'>打開</button> <canvas class='canvas' canvas-id='myCanvas' disable-scroll='true' ></canvas> </

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