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                                            xiaoheng21

https://developer.mozilla.org/zh-CN/docs/Web/HTML/Attributes/crossorigin 这里

https://developer.mozilla.org/zh-CN/docs/Web/API/CanvasRenderingContext2D/measureText

这样就好了

手写 new https://xiaoheng21.github.io/2019/05/18/%E6%89%8B%E5%86%99new/

Object.keys