javascript - 使用枚举形式 setInterval() 导致异常？

Question

我想使用 setInterval() 中的 enum。
例如:

declare global {
    enum En_Sch_Mode {
        Daily = 1,
        Manually = 4,
        Sensor = 5
    }
}

export class DeviceInfoEx {
 private m_time_handel: any;
 private m: DeviceInfo;
    constructor() {
        this.timer_check = this.timer_check.bind(this);
        this.m_time_handel = setInterval(this.timer_check, 1000);
    }

    public timer_check(): void {
        if (this.m.schedulemode === En_Sch_Mode.Daily) {
            console.log("hello world");
        }
    }
}

如果我遇到异常:

if (this.m.schedulemode === En_Sch_Mode.Daily) 

Exception has occurred: ReferenceError

ReferenceError: En_Sch_Mode is not defined

    at DeviceInfoEx.timer_check (d:\tfshomeprojects\Node.js\smartpow_ts\src\model\DeviceInfoEx.ts:80:37)
    at ontimeout (timers.js:475:11)
    at tryOnTimeout (timers.js:310:5)
    at Timer.listOnTimeout (timers.js:270:5)

Answer 1

按如下方式定义枚举:

export enum En_Sch_Mode {
    Daily = 1,
    Manually = 4,
    Sensor = 5
}

全局作用域的增强只能直接嵌套在外部模块或环境模块声明中。

如果您正在寻找 namespace ，请按以下步骤操作:

namespace myNameSpace{
    export enum En_Sch_Mode {
        Daily = 1,
        Manually = 4,
        Sensor = 5
    }
}

let enSchMode = myNameSpace.En_Sch_Mode.Daily;
console.log(enSchMode);

您可以在此处测试您的 typescript 有效性: https://www.typescriptlang.org/play/index.html