How to add single quote in the variable in Javascript?

Question

I have variable var str as following:

var str = tea;

I would like to make it as below

Answer 1

Escape each single quote with a back-slash:

var quote_str = '\'tea;\''

…or wrap the string in quotes of a different kind (i.e. double quotes), but be sure to escape the inner double quotes as to not unintentionally close the string:

var quote_str = "'tea;'"