JavaScript Newline Character

From this question, this ...

lines = foo.value.split(/\r\n|\r|\n/);

is one way to split a string, but how do I join it back with newlines?

Also, I wonder if I is say linux which uses开发者_开发问答 whichever newline character, then switch to windows, won't my web app break? The newlines become not recognized? Or maybe the browser does some conversion?

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If you want to join using newline characters, just do:

lines.join("\r\n");

But if you want to display on the HTML page, you'd want to wrap each line in <p></p> tags:

html = "<p>" + lines.join("</p><p>") + "</p>";

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You can use the Array object's join method to glue together array elements into a string:

lines.join("\r\n");

In CSS: remember to use

white-space: pre;

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Split it on /\r?\n/, in case the string includes the carriage returns with newlines.

join it with '\n', in any browser and any os.

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As said, join is the best, but here is the hard way (untested, I hope it's not too trivial):

var result;

for (i=0;i<lines.length;i++){
   result+=lines[i]+"\r\n"; //depends on OS
}

---

The following seems a future-proof, os-independent code:

lines.join(`
`)