JavaScript: Escape / Unescape Using _ instead of %

Using JavaScript, how can I use _ instead of % to escape characters?

var xyz = escape('Hello_World "123%"');
document.write( xyz );
document.write( '<hr/>');
document.write( unescape(xyz) );

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LVL 16
hankknightAsked:
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Big MontyConnect With a Mentor Senior Web Developer / CEO of ExchangeTree.org Commented:
you would have to do it manually:

var xyz = Hello_World "123%';
xyz = xyz.replace( '%', '_' )
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