HarmonyOS 使用CanvasRenderingContext2D如何画粗体文字

可以给font设置属性font-weight，参考文档中的font：https://developer.huawei.com/consumer/cn/doc/harmonyos-references-V5/ts-canvasrenderingcontext2d-V5#属性

demo：

// xxx.ets
@Entry
@Component
struct Fonts {
  private settings: RenderingContextSettings = new RenderingContextSettings(true)
  private context: CanvasRenderingContext2D = new CanvasRenderingContext2D(this.settings)

  build() {
    Flex({ direction: FlexDirection.Column, alignItems: ItemAlign.Center, justifyContent: FlexAlign.Center }) {
      Canvas(this.context)
        .width('100%')
        .height('100%')
        .backgroundColor('#ffff00')
        .onReady(() =>{
          this.context.font = '30vp bold sans-serif'
          this.context.fillText("Hello Word", 20, 100)
          this.context.font = '30vp sans-serif'
          this.context.fillText("Hello Word", 20, 300)
        })
    }
    .width('100%')
    .height('100%')
  }
}