为什么jslint不喜欢在函数表达式上使用call（）？

Question

I'm getting this error.

Unexpected '.'.

for this line:

}).call(this);

I checked jslinterrors.com and could not find a reason.

Reproduce the error using:

(function () {
    "use strict";
    var a = 1;
    a = a + 1;
}).call(this);

Answer 1

Probably because your using an anonymous function which is an anti pattern in this way. The following should work:

(function () {}())

Answer 2

I don't see anything wrong with with the code that you supplied. Perhaps there is something not right in the parsing that jslint performs, or maybe there is a real reason for the warning, I can't find one. With a little dancing you can be off with the warning, by writing it like this.

/*global console */
(function () {
    "use strict";

    return function () {
        var a = 1;
        a = a + 1;
        console.log(this);
    };
}()).call([]); // used array rather than this so that it is easy to see in console

On jsFiddle

Answer 3

Functions wrapped in parenthesis are meant to be invoked immediately so you cannot use .call() there.

Example of function use

(function () {
    // do something
})();

Instead you could do

var foo = function () {
    // do something
};

foo.call(this); // within scope