Generally, as long as you keep using the same type of quote, you double the \'s for each nested level, so try: 
example.jsfunction('<a href=\'\' onclick=\\'alert(\\\\'test\\\\')\\'><
+/a>')

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In reply to Re^2: Perl, JavaScript and quoting/escaping by Anonymous Monk
in thread Perl, JavaScript and quoting/escaping by isync

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