无法访问另一个CoffeeScript文件中的函数？

Question

我需要将src中的图像的background.coffee设置为另一页，但是当我从backround.coffee调用该函数时，我得到了view.setScreenshotUrl is not a function。

//background.coffee
views = chrome.extension.getViews()
for view in views
    if view.location.href is viewTabUrl
        view.setScreenshotUrl screenshotUrl
        break

//page.coffee
setScreenshotUrl = (url) -> 
    document.getElementById("target").src = url

Answer 1

我将该函数添加到窗口对象中：

window.setScreenshotUrl = (url) -> 
    document.getElementById("target").src = url