Script language = “javascript” > Var r = “1, n2 and n3 \ n”; // replace the element number with the letter \n Alert (r.r eplace (” \ n ”, ”;” ));

Results: 1; 2\n3\n just replaced the first one < / script>

< Script language = “javascript” > Var r = “1, n2 and n3 \ n”; // replace the element number with the letter \n Alert (r.r eplace (\ n/g, ”;” ));

Results: 1; 2; 3; The first parameter of replace can be a regular expression, and /g identifies a full-text match. < / script>