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Editorial Team
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Asked: 2026-05-31T02:47:08+00:00

I have code below of an HTML page that includes a JS file. Function

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I have code below of an HTML page that includes a JS file. Function d() receives a String of 24 chars, including 3 non-printable chars (ASCII 005) and counts how many characters are included. This number is displayed with an alert().

  • Google Chrome: correctly displays 24 as a result.
  • Google Chrome (JS debugger): correctly displays 24 as a result.
  • Internet Explorer 9: correctly displays 24 as a result.
  • Internet Explorer 9 (JS debugger): displays only 21 (24 – 3 non printable).

I really need this to work with Internet Explorer. Any ideas? THANKS

TEST.HTML

<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>JavaScript Scripting</title>
</head>
<body>
<script type="text/javascript" charset="utf-8" src="test.js">
</script>
</body>
</html>

TEST.JS

function d(a){return a.length;};
document.write("<script language=\"Javascript\" charset=\"utf-8\">alert(".concat(d("a[NULL]lert(\"He[NULL]llo Worl[NULL]d\");")).concat(");</script>"));
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1 Answer

  1. Editorial Team

    You should to know when IE lost this bytes! But it looks like it miss them exact on split: check if IE returns true on “” == “\u0005”. Try to avoid using hack like smth +"" use toString() ( what would you get after 'Infinity' -0 ?). Or use var i= 0; while (a.length) { substr(a, 0, 1); i+=1; //... no IE to test, but could help.

    UPD

    As provided by MSDN IE not in standard mode and less then 9 evaluates "\v" == "v" as true, so it could be the same with nullchar which causes the string length becomes shorter?

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