Personally I'd only be okay with doing this if I were significantly under-qualified for the position, and the offer was basically "We wouldn't normally hire someone like you for this position, as you don't have the [n] years of experience that we were looking for, but you interviewed well and seem like a real go-getter. We will consider raising your salary at a later date if you turn out to be able to perform at the level we were hoping to hire to."
If that weren't the case, I would probably walk away. If I really liked the job I might counter with my desired salary ("I'm sorry, but I'm looking to make $1400."), but I wouldn't bet on it - and only if I really liked it. Otherwise I walk away, fast. You're a valuable resource, don't take something that's insufficient for your needs or value.
On the other hand, if that were the case (that I was massively under-qualified), I would then ask for some evidence of this: particularly, I would ask for a job ladder or promotion track document, which most larger companies should have. This indicates what the expectation is for promotion/salary ranges.
I would also ask if I could talk to a few of the people I would be working with, and ask them some questions - particularly, "how does the salary raise/bonus system work". Don't expect them to say negative things about the company, but what they do/don't say can be informative.
Finally, if I did take the job, I'd have a plan in place for what to do in a year or two years (or whatever I considered appropriate) if I don't have a particular salary by then. If the salary didn't hit that point, then I'd implement the plan - probably looking for another position aggressively.
This all assumes that I took the job, which would depend on what it might produce in a few years. This is similar to what I did starting out: I took a programmer job that was underpaying (more than I was making outside of programming, but still underpaid) but I was under-qualified for, with the explicit expectation that either in 3-5 years I would be making more, or I would be able to find a better job. 3 years later I was making more, and a bit over 5 years later I found a better job. I didn't assume the company would pay me more necessarily over time; I checked at each point if I was making what I felt I should, and when I wasn't anymore, I went elsewhere.
In the long run, it worked out for me - because I got valuable experience I could translate into more money elsewhere.