![](/img/trans.png)
[英]Element implicitly has an 'any' type because expression of type 'string' can't be used to index type '{ AT: number; BE: number,…}`
[英]Element implicitly has an 'any' type because the expression of type 'any' can't be used to index type '{ 1: number; 2: number; 3: number; }'
以下代码抛出:
Element implicitly has an 'any' type because the expression of type 'any' can't be used to index type '{ 1: number; 2: number; 3: number; }'.
const obj = {
1: 1,
2: 2,
3: 3,
}
fetch('http://example.com/foo.json')
.then(response => response.json())
// 👇 throws
.then(data => console.log(obj[data]))
而不是列出所有可能的键:
const obj = {
1: 1,
2: 2,
3: 3,
}
fetch('http://example.com/foo.json')
.then(response => response.json())
// 👇 list all possible keys
.then(data => console.log(obj[data as 1 | 2 | 3]))
有没有更好的方法来修复这个错误?
单线:
const obj = {
1: 1,
2: 2,
3: 3,
}
fetch('http://example.com/foo.json')
.then(response => response.json())
// 👇 one-liner
.then(data => console.log(obj[data as keyof typeof obj]))
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