javascript 如何使用 CoffeeScript 设置间隔？
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How do I setInterval with CoffeeScript?
提问by Shamoon
My JavaScript is as follows:
我的 JavaScript 如下：
var util = require('util');
EventEmitter = require('events').EventEmitter;
var Ticker = function() {
var self = this;
setInterval( function() {
self.emit('tick');
}, 1000 );
}
What's the equivalent CoffeeScript?
什么是等效的 CoffeeScript？
回答by Billy Moon
util = require 'util'
EventEmitter = require('events').EventEmitter
Ticker = ->
self = this
setInterval ->
self.emit 'tick'
, 1000
true
You add the second parameter by lining up the comma with the function you are passing to, so it knows a second parameter is coming.
您通过将逗号与您传递给的函数对齐来添加第二个参数，因此它知道第二个参数即将到来。
It also returns true instead of setInterval, although I can't personally see the advantage of notreturning the setInterval.
它也返回 true 而不是 setInterval，虽然我个人看不出不返回 setInterval的好处。
Here is a version with thick arrow (see comments), and destructuring assignment (see other comment). Also, returning the setInterval instead of explicitly returning true.
这是一个带有粗箭头（见评论）和解构赋值（见其他评论）的版本。此外，返回 setInterval 而不是显式返回 true。
util = require 'util'
{EventEmitter} = require 'events'
Ticker = ->
setInterval =>
@emit 'tick'
, 1000
