无法传递作为setTimeout函数传递的匿名函数的参数

Question

I'm having a trouble to pass a value to argument of anonymous function which is passed as an argument of setTimeout function.

I've been stuck for more than 5 hours already...

Please take a look at the code below and give me a help.

Thanks in advance!!

    if (_que.length > 0){

        var nextUrl = _shiftNextUrlFromQue();

        //here, the value for nextUrl exists.the value is url string.
        console.log(nextUrl); 


        setTimeout(function(nextUrl) {

            //here, the value is undefined.
            _analyzeUrl(nextUrl);


            }, 10000
        );

    }

Answer 1

You are expecting nextUrl as an argument to the setTimeout callback function. That variable is defined in the parent function scope and there is the value you need.

The correct code would've been:

if (_que.length > 0) {

    var nextUrl = _shiftNextUrlFromQue();

    //here, the value for nextUrl exists.the value is url string.
    console.log(nextUrl); 


    setTimeout(function() { //HERE!... the timeout callback function has no argument

        _analyzeUrl(nextUrl);


        }, 10000
    );

}

Answer 2

Don't pass it, you're nullifying it http://jsfiddle.net/5cckcrhj/

setTimeout(function() {
     _analyzeUrl(nextUrl);
}, 10000