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in Technique[技术] by (71.8m points)

TypeScript泛型默认值没效果

function demo<T = string>(params: T) {
  console.log(params);
}
demo(1); // success

上面这代码预期会报错,但实际执行成功。


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by (71.8m points)

你都已经知道是默认值了……

默认值的意思难道不是当你不指定的泛型类型的时候、泛型类型才是它吗?

你这已经隐式指定相当于 demo<int>(1); 了。


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