canvas drawimage在开发工具上会在所有图形中绘制

在真机中符合效果

代码

this.cav = wx.createCanvasContext("cav", this);

let ctx = this.cav;

let self = this;

// this.drawBg('blue', rpx(320), rpx(240));

ctx.rect(0, 0, rpx(120), rpx(40))

ctx.setFillStyle('yellow')

ctx.fill();

ctx.restore();

self.cav.save();

self.cav.beginPath();

self.cav.arc(70, 70, 25, 0, 2*Math.PI);

self.cav.clip();

await this.drawImage(

`https://mp.weixin.qq.com/debug/wxadoc/dev/image/cat/0.jpg?t=2018614`, rpx(160), rpx(120));

this.cav.draw();

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