The evil "missing identifier, string, or number"

FF and Chorme no problem, ie in error: "Missing identifier, string or number"

have been unable to find the reason, on-line check that the JSON object is a comma, I found all the problems, countless times to find the original for is a keyword, with double quotation marks included will not error. Hereby make a mark.

var layerspan = domconstruct.create ("label", {                    for: Name,                    innerhtml:name                }, div);

Just for double quotes.

var layerspan = domconstruct.create ("label", {                    "for   ": Name,                    innerhtml:name                }, div);

The evil "missing identifier, string, or number"