jslint错误：意外'在'。与undefined比较，或使用hasOwnProperty [英] jslint error: Unexpected 'in'. Compare with undefined, or use the hasOwnProperty

问题描述

我有以下javascript函数未通过jslint检查

 函数hasActiveX（）{
 return（' ActiveXObject'在窗口中）; 
} 
  

jslint错误

 意外'输入'。与undefined比较，或使用hasOwnProperty方法。 
  

我应该忍受jslint错误，还是有更好的方法来确定ActiveXObject？
我找不到跳过此检查的jslint标志？

解决方案

我认为JSLint要求您尝试：

  function hasActiveX（）{
 return window.hasOwnProperty（'ActiveXObject'）; 
} 
  

或者与undefined进行比较的其他建议：

  return（typeof（window.ActiveXObject）！=undefined）; 
  

就个人而言，我更喜欢前者。

阅读完评论之后，如果JSLint停止抱怨，似乎中的实际上是有用的，否则我会尝试上面的选项2。 / p>


I have the following javascript function that fails a jslint check

  function hasActiveX() {
    return ('ActiveXObject' in window);
  }

jslint error

Unexpected 'in'. Compare with undefined, or use the hasOwnProperty method instead.

should I just live with the jslint error, or is there a better way to determine ActiveXObject? I could not find a jslint flag to skip this check?

解决方案

I think JSLint is asking you to try:

function hasActiveX() {
    return window.hasOwnProperty('ActiveXObject');
}

Or the other suggestion of comparing against "undefined":

return (typeof(window.ActiveXObject) != "undefined");

Personally, I prefer the former.

After reading the comments, it seems like in is actually useful if JSLint would stop complaining about it, otherwise I would try option 2 above.

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