问题
I'm authoring a simple userscript that will give the backspace button navigation control like in windows (specifically this is for linux users) for Chromium browser.
This script was working, then I made a few alterations to it (very simple stuff, commenting, tabbing, making it pretty), and now i'm getting this error:
Uncaught SyntaxError: Unexpected token (
on this line
document.head.appendChild(script);
The script is located here - i'm pulling out my hair trying to figure this out.
The script really only applies to chromium as ff gives you a configuration option to enable this functionality.. - Chromium 15.0.874.106 (Developer Build 107270) Ubuntu 11.10
Edit if someone can tell me why this doesn't work that would be great
EmbedCodeOnPage("(function() {" + fn.toString() + "})();"); // fails
EmbedCodeOnPage("(" + fn.toString() + ")()"); // works.
回答1:
because you are just dropping in an anonymous function and not executing it
change line 46 and add ()
回答2:
I believe the actual error is here:
function EmbedFunctionOnPageAndExecute(fn) {
EmbedCodeOnPage("(function() {" + fn.toString() + "})();");
}
fn.toString is already going to format your function like this:
function () { /* code here */ }
So you're going to end up with this:
(function() { function () { /* code here */ } })();
This is clearly not what you want. You want to execute the inner function.
回答3:
I had the same problem, even with simple function. This might be due to incorrect syntax of the function definition itself, especially switching between java to javascript.
if i declare function with in an object definition such as calculateTax(){//some logic;} and run, i get "SyntaxError: Unexpected token (" - this is due to the fact that function declaration is not correct format/syntax. The error is misleading, however by changing it to calculateTax : function(){//some logic;} resolves the issue. Hope this helps. Thanks.
来源：https://stackoverflow.com/questions/8482681/uncaught-syntaxerror-unexpected-token-but-there-is-no-error