Is there a way to print out the line number of a js file in the console log

问题

For debugging purposes, I usually use something like console.log('line number #').

Not sure if it's the best way to handle it but I think it would be helpful if I can just print out the line number of the line where I'm putting the console.log() dynamically.

Let's say:

1    //do something
2    if(file){
3        console.log('Line 3');
4        $('#uploads').css({ 'height' : 'auto' });
5    } else { 
6       console.log(getLineNumber());   //just an example
7       $('#tags').val(temp);
8    }

In the above, if I happen to remove line 1 for instance, line 3 will be technically incorrect as the line number is decremented by 1 but the log will still show 3. But in line 6, suppose getLineNumber() returns the line number, then it will still make sense even after a line above has been removed.

So is there an easy way which acts like getLineNumber()?

回答1:

You can use onerror event handler for that.

See the last example on this page: http://www.tutorialspoint.com/javascript/javascript_error_handling.htm

Direct link to example: http://www.tutorialspoint.com/cgi-bin/practice.cgi?file=javascript_40

来源：https://stackoverflow.com/questions/9290000/is-there-a-way-to-print-out-the-line-number-of-a-js-file-in-the-console-log