问题
I'm using Mechanize for scraping images url then I'm looking http://mechanize.rubyforge.org/Mechanize/Page/Image.html for to know width and height images.
I write in console:
url = "http://www.bbc.co.uk/"
page = Mechanize.new.get(url)
images_url = page.images.map{|img| img.width}.compact
I get the result:
["1", "84", "432", "432", "432", "432", "432", "432", "432", "304", "144", "144", "144", "144", "144", "144", "432", "432", "432", "432", "432", "432", "432", "336", "62", "62", "62", "62", "84", "1", "0"]
This result works fine for me I get image's width.
However with others web pages I get nil e.g. you can check with this web page:
url = "http://www.glamourum.com" #check also with https://www.birchbox.com/
page = Mechanize.new.get(url)
images_url = page.images.map{|img| img.width}.compact
I get a result:
=> []
an array empty :O or for https://www.birchbox.com/ I get an array with:
=> ["1", "1", "1", "1", "1"]
why this happens with some websites and does not occur with other websites?
What is the solution for this problem?
回答1:
Mechanize doesn't fetch the images. It can only return you the size as reflected on the img tag in the HTML and a lot sites don't include that.
来源：https://stackoverflow.com/questions/9447571/methods-width-and-height-mechanize