fix bug: change encoding after doc to str
fix bug: change encoding after doc to str

hack4code/BlogSpider,hack4code/BlogSpider,alone-walker/BlogSpider,wartalker/BlogSpider,hack4code/BlogSpider,hack4code/BlogSpider,alone-walker/BlogSpider,wartalker/BlogSpider,alone-walker/BlogSpider,wartalker/BlogSpider,alone-walker/BlogSpider,wartalker/BlogSpider