@decorator 装饰器

@sleep.ts

/**
 * 控制一个函数延后执行
 * @param tick 休眠时间
 */
function sleep(tick: number){
    return (target: any, propertyKey: string, descriptor: PropertyDescriptor) => {
        let method = descriptor.value;
        descriptor.value = (...args: any[]) =>{
            setTimeout(()=>{
                method.apply(target, args)
            }, tick);
        }
    }
}

class Wait{
    constructor(){}

    @sleep(3000)
    do(yell: string){
        console.log("我终于被执行了" + yell);
        console.log(new Date().getSeconds());
    }
}

const waiter: Wait = new Wait();
/** 记录函数执行的开始时间 */
console.log("Start" + new Date().getSeconds())
waiter.do("欢呼");