为什么js代码在网页中工作，但在GreaseMonkey中失败？

Question

我创建了一个隐藏的框架如下：

var oHiddenFrame = null; 
if(oHiddenFrame == null){ 
oHiddenFrame = document.createElement("iframe"); 
oHiddenFrame.name = "hiddenFrame"; 
oHiddenFrame.id = "hiddenFrame"; 
oHiddenFrame.style.height = "0px"; 
oHiddenFrame.style.width = "0px"; 
oHiddenFrame.style.position = "absolute"; 
oHiddenFrame.style.visbility = "hidden"; 
document.body.appendChild(oHiddenFrame); 
} 

然后听众：

var fnLocation = function(){ 
frames["hiddenFrame"].location.href = "http://meckmeck.cn"; 
} 

var oButton = document.getElementById("mb_submit"); 
oButton.addEventListener("click", fnLocation, false); 

它正常工作，在一个网页，但写在的GreaseMonkey

Answer 1

时有将报告frames.hiddenFrame is undefined你试过，

document.getElementById('hiddenFrame').location.href = "http://meckmeck.cn";