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並前往https://stackoverflow.com/questions/65248072/cant-read-property-clearrect-of-undefined-in-javascript

Can't read property 'clearRect' of undefined in javascript

You lost context: class Tank { draw() { console.log('draw'); } update() { this.draw(); } } const tank = new Tank(); // Call method of ...

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查詢 「clearRect」的人也找了：

  1. clearRect
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  2. strokeText
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  3. Canvas clear
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  4. clearrect doesn't work
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  5. createRadialGradient
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  6. measureText
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  7. fillRect
    8.
  8. closePath
    9.