Differences between jquery single quotes and double quotes

In js, single quotes and double quotation marks are the same. We try to use single quotes whenever we use them. Only when we encounter nesting will we use two quotation marks at the same time, interested friends can understand the executable Syntax: $ ("ul li "). filter (": contains ('canon '),: contains ('panasonic'),: contains ('case')" ).css ("color", "red ");

Incorrect syntax: $ ("ul li "). filter (": contains (" canon "),: contains (" Panasonic "),: contains (" Casio ")" ).css ("color", "red ");

According to the data, single quotes and double quotation marks are the same in Javascript, but the problem is encountered. Baidu gave me the answer, saying that single quotes should be used whenever possible, two quotation marks are used at the same time only when Nesting is encountered. That is to say, double quotation marks must be used when the outside is single quotation marks, and single quotation marks must be used when the outside is double quotation marks. In short, double quotation marks or single quotation marks cannot be used at the same time;