javascript syntax with escaping slash -

javascript syntax with escaping slash -

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why need escape '/' character in javascript? [duplicate] 4 answers

i've noticed sites utilize method backup source if google's hosted jquery fails load. copied too, , curious syntax:

window.jquery || document.write('<script src="/js/jquery.min.js"><\/script>');

as understand it, if jquery false or undefined, write out script load jquery locally.

what i'm unsure of is, point of \ in closing script tag? there escape?

thanks!

you escaping whole </script> tag itself. because, many of older browsers think script gets ended here:

window.jquery || document.write('<script src="/js/jquery.min.js"></script>'); -----------------------------------------------------------------^

that point becomes end of original <script> tag!

javascript syntax