Set tab and wrap in vim

Today when using the Vim editor to find the default tab key is 8 characters, so think of it set to four spaces, after Baidu, got the following methods:

First Enter/ETC/VIM/VIMRC

Then add the following code at the end of the document:

Set tabstop=4 setting tab indent to 4 characters

Set Expandtab converted to spaces

Set autoindent setting Auto Indent

But then there came a new problem in the Run Times error: taberror:inconsistent use of tabs and spaces in indentation

In order to solve this problem, search again, after several failures, and finally got the solution:

Set tabstop=4

Set softtabstop=4

Set shiftwidth=4

Set Expandtab

Set Autoindent

It works fine thereafter.

Summed up is the Vim space bar and tab can not be mixed, when mixed with error

Set tab and wrap in vim