javascript - Do single/double quotes make a difference if nothing is escaped? -


as see it, both 'mars%22%3a%22' , "mars%22%3a%22" equivalent, nothing being escaped.

i have been creating javscript bookmarklet time now. @ 1 point, stopped working when pasted as-is bookmark in chrome.

i discovered solution after guess-and-check:
a pair of double quotes needed single quotes. why?

the following line single-quotes inside split() causes no problems in bookmarklet:

loaddoc("/page1/" + aarray[i].href.split('mars%22%3a%22')[1].slice(0,7),i);

the line below double quotes cause bookmarklet not run @ all:

loaddoc("/page1/" + aarray[i].href.split("mars%22%3a%22")[1].slice(0,7),i);

no error shown in console.

note double-quote version run fine if pasted javascript console directly!

what not understanding?

javascript not distinguish between single , double quotes in way language ruby (where string interpolation , backslash escape sequences work in double-quoted string). both types of quote have same meaning in javascript.

the 1 difference whichever type of quote use, same quote can't used inside string unless escape backslash or url-encode it.

in case of bookmarklet, browser unescapes entire javascript:... url string before executing it. can test simple case javascript:alert('foo%22bar') alert text foo"bar.

so string mars%22%3a%22 converted mars":" before code runs. since string has double-quotes in it, can used inside single-quoted string.

btw, hunch correct may attempting parse or manipulate json text here? if are, better use json.parse() instead of raw string manipulation.


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