小程序canvas中drawImage自适应宽度铺满屏幕

在微信小程序创建画布并且自适应屏幕宽度铺满屏幕 wxml先创建一个画布 <view class='page'> <button bindtap='click' type='primary' size='mini'>打开</button> <canvas class='canvas' canvas-id='myCanvas' disable-scroll='true' ></canvas> </

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