不清楚你出于何种需求要这么搞。只打印一次的猜测：同一个canvas, draw后只回调一次。解决方案：
wxml: 动态创建canvas
<block wx:
for
=
"{{tempfileLen}}"
>
<canvas canvas-id=
"canvas_{{index}}"
/>
</block>
js：
this
.setData({
tempfileLen: tempFilePaths.length
})
(let i
in
tempFilePaths) {
let ctx = wx.createCanvasConetext(`canvas_${i}`)
....
}
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存储赞助商为
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站点运行状态监控由 
强力驱动
