javascript块将无法运行

Question

take a look at this: this is a screen I took from firebug. I don't know why but the browser just refuse to run the code within the lines with gray line number.The breakpoint above is never reached. There is no syntax error, no warning whatsoever. What have I ran into?

edit: I tried with latest chrome and firefox.

Answer 1

I simply avoid do while at that place and it works! Never really sure why.