Js 判断网页窗口是否滚动到底部
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-----------例子2---------------------------------------
<html lang="en"> <head> <meta charset="utf-8"> <title> test scroll bootom append child element </title>gfhgfhg
gfhgfhg
gfhgfhg
gfhgfhg
gfhgfhg
gfhgfhg
gfhgfhg
gfhgfhg
gfhgfhg
gfhgfhg
gfhgfhg
gfhgfhg
gfhgfhg
gfhgfhg
gfhgfhg
gfhgfhg
gfhgfhg
gfhgfhg
gfhgfhg
gfhgfhg
gfhgfhg
gfhgfhg
gfhgfhg
gfhgfhg
6666
444
fffffffffffffffff
test red font.