typescript 打字稿阴影变量
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Typescript shadowed variable
提问by RBasniak
I'm using TSLint in a TypeScript project and it's complaining about the variable iin the following code:
我在 TypeScript 项目中使用 TSLint，它抱怨i以下代码中的变量：
for (let i = 0; i < body.children.length; i++)
{
body.children[i].classList.remove('active');
}
The message is 'Shadowed variable: 'i' (no-shadowed-variable)'
消息是 'Shadowed variable: 'i' (no-shadowed-variable)'
Is there anything wrong with this loop and what would be the correct way of doing a for loop in TS?
这个循环有什么问题吗？在 TS 中执行 for 循环的正确方法是什么？
回答by Oblosys
Shadowing means declaring an identifier that has already been declared in an outer scope. Since this is a linter error, it's not incorrect per se, but it might lead to confusion, as well as make the outer iunavailable inside the loop (where it is being shadowed by the loop variable.)
阴影意味着声明一个已经在外部作用域中声明的标识符。由于这是一个 linter 错误，它本身并没有错，但它可能会导致混淆，并使外部i在循环内不可用（它被循环变量遮蔽）。
You can rename either of the ivariables, but if you add the rule "prefer-for-of": trueto your tslint.json, TSLint will suggest an elegant solution in this case:
您可以重命名任何一个i变量，但如果您将规则添加"prefer-for-of": true到您的tslint.json，TSLint 将在这种情况下建议一个优雅的解决方案：
for (const child of body.children) {
child.classList.remove('active');
}
(provided childhasn't been declared already :-)
（前提child是尚未声明:-)
