How to output strings as they are in php-js

In addition to escape, how can I output strings with escape characters as they are? For example: url & quot; E: itcastclassphpjsday2abc.html & quot; alert (url); how can I display the pop-up content as it is (including also displayed )? Phpjavascript

In addition to escaping with \, how can I output strings with \ and other escape characters as they are?

Example: url = "E: \ itcast \ class \ php \ js \ day2 \ abc.html ";
Alert (url );
How can I display the pop-up content as is (including )?