处理这样的异步工作的一种方法是使用回调函数，例如：

One way to deal with asynchronous work like this is to use a callback function, eg:

function firstFunction(_callback){
    // do some asynchronous work
    // and when the asynchronous stuff is complete
    _callback();    
}

function secondFunction(){
    // call first function and pass in a callback function which
    // first function runs when it has completed
    firstFunction(function() {
        console.log('huzzah, I\'m done!');
    });    
}

根据@Janaka Pushpakumara的建议，你现在可以使用箭头功能来实现同样的目的。例如：

As per @Janaka Pushpakumara's suggestion, you can now use arrow functions to achieve the same thing. For example:

firstFunction（（）=> console.log（'huzzah，我已经完成了！'）