"for"  loop statement and "reindent" for sublime
for-in loops and ":last"  last selector

Notes:
for (i in array)  :
i is an index, dont need to declare as var i, instead, we declare it in
the later coding as "array[i]"

:last  selector:
take care there are more than class, id, p or other elements.
注意出现多个class ,id 时，可能会需要，特别是在循环中。

"#id" ".class"
take care.