react string 转double

您可以使用 JavaScript 中的内置函数将字符串转换为 double 类型。以下是示例代码：

const str = "3.14";
const num = parseFloat(str); // 将字符串转换为数值类型
console.log(num); // 输出 3.14，类型为 double

解释一下，`parseFloat()` 是一个 JavaScript 内置函数，它将一个字符串解析成一个浮点数。在上面的示例中，我们将字符串 `"3.14"` 传递给 `parseFloat()` 函数，并将返回值存储在 `num` 变量中。`console.log()` 函数用于在控制台输出结果。

希望能够帮到您！

相关问题

type IActiveKey = 'http' | 'dns' | 'ping' | 'tracetroute'; interface IContext{ activeKey: IActiveKey; } const context: IContext = { activeKey: ‘http’ } 帮我更正一下这段react-ts的代码

Sure, here's the corrected React-TS code:

type IActiveKey = 'http' | 'dns' | 'ping' | 'traceroute';

interface IContext {
  activeKey: IActiveKey;
}

const context: IContext = {
  activeKey: 'http'
};

The correction includes:

- Fixing the quotation marks around the string value for `activeKey` to use straight single or double quotes (`'` or `"`), as opposed to curly quotes (`‘` or `’`).
- Correcting the spelling of `traceroute` to `traceroute` in the type definition for `IActiveKey`.