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];
}
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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
},
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