无法在TypeScript中重新声明块范围变量'name'

Question

嗨,我正在学习打字稿.

我的代码中有.

var name:string="Hello world";
console.log(name);

在编译时,我收到此错误.

error TS2451: Cannot redeclare block-scoped variable 'name'.
index.ts(4,5): error TS2451: Cannot redeclare block-scoped variable 'name'.

有人能形容我为什么会收到这个错误吗？

Answer 1

该name属性在window对象上定义:

interface Window extends EventTarget, WindowTimers, WindowSessionStorage, WindowLocalStorage, WindowConsole, GlobalEventHandlers, IDBEnvironment, WindowBase64, GlobalFetch {
    ...
    name: string;
    ...
}

(https://github.com/Microsoft/TypeScript/blob/master/lib/lib.d.ts#L17226)

您需要为变量提供一个新名称:

var myname = "Hello world";
console.log(myname);

Answer 2

您可以export{}在文件的开头添加。