Use of HTML space escape characters

Summarize the use of the space in the HTML, because the work will sometimes want to use a space to do the same column of text alignment, now summarize the space of the escape character is divided into the following categories:

Usually used is the  

1.  &160#; continuous whitespace (1 character width)

2.  &8194#; half Blank (1 character width)

3.  &8195#; a blank (2 character width)

4.  &8201#; narrow Blank (less than 1 character width)

Usually used   but in Chinese may sometimes be more suitable for  

Use of HTML space escape characters