TypeScript中用for in遍历对象的属性

在 TS 中使用对象遍历时，下角标不允许是字符串。

for (let k in obj) {
  let s = obj[k];
}

报错： Element implicitly has an ‘any’ type because expression of type ‘string’ can’t be used to index type ‘{ ..... }’. No index signature with a parameter of type ‘string’ was found on type ‘{..... }’.ts(7053)

解决办法为修改tsconfig.json，允许索引

"compilerOptions": {
    //...
    "suppressImplicitAnyIndexErrors": true
  },