jquery single and double quotes distinguish and use note

In JS, single and double quotes are the same, usually use when using single quotes, only when you encounter nesting will be used in two quotes, interested friends can understand the syntax can be executed: $ ("ul Li a"). Filter (": Contains (' Canon ')": Contains (' Panasonic '),: Contains (' Casio '). CSS ("Color", "red");

Incorrect syntax: $ ("ul Li a"). Filter (": Contains (" Canon "),: Contains (" Panasonic "),: Contains (" Casio "). CSS (" Color "," red ");

According to the data shown in JS single quotes and double quotes are the same, but in the use is to encounter problems, so Baidu gave me the answer, that is usually used when the use of single quotes, only when the nesting will be used in two quotes. That is, when the outside is a single quotation mark, the inside is to use double quotes, the outside is a double quotation mark in the time to use single quotes, in short, can not use double quotes or single quotes;