Question

Radiant::loadCSS = (fn, scope) ->
  head = document.getElementsByTagName("head")[0]
  link = document.createElement("link")
  link.setAttribute "href", "/" + ri.context + "/css/" + @obj + ".css"
  link.setAttribute "rel", "stylesheet"
  link.setAttribute "type", "text/css"
  sheet = undefined
  cssRules = undefined
  if "sheet" of link
    sheet = "sheet"
    cssRules = "cssRules"
  else
    sheet = "styleSheet"
    cssRules = "rules"
  timeout_id = setInterval(->
    try
      if link[sheet] and link[sheet][cssRules].length
        clearInterval timeout_id
        clearTimeout timeout_id
        fn.call scope or window, true, link #LINE THAT ERRORS OUT!!!
    #finally
  , 10)
  timeout_id = setTimeout(->
    clearInterval timeout_id
    clearTimeout timeout_id
    head.removeChild link
    fn.call scope or window, false, link
  , 15000)
  head.appendChild link
  link

以上是我从这里翻译的函数的翻译：Dynamically loading css file using javascript with callback without jQuery

当我在直接javascript中使用它时效果很好，但咖啡版本在ie8 'fn' is null or not an object

给我带来了问题

以下是该部分的呈现javascript：

timeout_id = setInterval(function() {
  try {
    if (link[sheet] && link[sheet][cssRules].length) {
      clearInterval(timeout_id);
      clearTimeout(timeout_id);
      return fn.call(scope || window, true, link); //ERROR LINE!!!
    }
  } catch (_error) {}
}, 10);

无论如何，我是try和catch的新手，只是不明白这里出了什么问题。提前谢谢大家！

Answer 1

我认为这与try / catch关系不大，而且无论出于何种原因都与此有关，fn在回调执行时没有定义（如错误所示）。在您收到错误的情况下，您确定fn被传递到loadCSS吗？

咖啡脚本尝试并在IE8中捕获失败

1 个答案: