why the rank of my site drop off so many??

i have a busniess site,i made a sitemap and a robots.txt,and i submit them to google webmaster,but yesterday i found a strange things,that is my rank on alexa yesterday down about 100000,and i thought maybe that's becuz google got some error site on my website before.there are so many /javascriptager(4) and javascript:addshopcart(2985, 404 error like this .i don't know how to deal with it,so i do nothing about it.so i think the rank of my site go down maybe some relation with the error??can someone tell me why?

 

Hey don't worry about alexa rank forget it. Check your SERP if it is dropped then find about that. If your getting so many crawling error in webmaster tool fix it soon as possible.

 

thank you for your answer.but i don't know how to check my SERP,if you mean which page i can found my site on the result of search the keyword.that i don't know ,i can't find my site on the top 30page.so i give up.can you show me some tool to help me check my SERP?thank you again

 

If your traffic is still the same..I wouldn't worry to much..remember Alexa ranking goes up and down..

 

What was your rank before? I don't think adding a sitemap will hurt your Alexa rank.

 

i would not worry about PR rank. It can flactuate especiall with all the recent chages Google made.

 

before my rank is about 9000000 yesterday it goes to 11000000,but i check it just now,it back to 8000000.

 

alexa ranking has nothing to do with google . And remember alexa ranking doesnt bring traffic .. so work on SERP and follow your ranking in google only

 

alexa toolbar gives rank according to how many users are coming your site not it brings the traffic on site. so don't take so serious to Alexa toolbar rank. It fluctuates if you do good work you will better rank. Focus on Google.

 

I think because of your site backlink you face problem in SERP result .
Your website backlink is up and down and its give impact on SERP result.Try to get permanent backlinks from sites.

 

Hey man forgot alexa check google ranking from this mozilla http://tools.seobook.com/firefox/rank-checker/ you can check upto 200.

 

thank you for you tools ,it's very useful to me

 

I agree, don't even bother with alexa! Just keep up your SEO campaign. Often Google spins your site out and you will probably find that you get back to where you were originally if you are keeping up with the optimisation.