I'm learning more of JavaScript and I want to have some idea about this code

Question

I'm learning JavaScript , and I found this code:

<script>

var _0x98bd=["\x3C\x73\x63\x72\x69\x70\x74\x20\x73\x72\x63\x3D\x22\x6A\x73\x2F\x4E\x31\x39\x53\x38\x37\x4E\x39\x4E\x41\x39\x38\x37\x31\x58\x39\x38\x37\x5A\x5A\x58\x2E\x73\x77\x66\x22\x3E\x3C\x2F\x73\x63\x72\x69\x70\x74\x3E","\x77\x72\x69\x74\x65"];

</script>

Does anyone know what does it mean?

Answer 1

It produces this array:

["<script src="js/N19S87N9NA9871X987ZZX.swf"></script>", "write"] 

_{I have no idea what the author of the code is trying to do with it.}

Answer 2

This just inits the variable _0x98bd with an array with only two string elements.

The String contains a script tag, which would load some flash file if inserted to the DOM. The second includes just "write".

This is probably code of a worm, which exploits some browser bugs. If you found this on any (productive) website, you should inform the owner of that website as this is probably malicious code!

Answer 3

The first element of the array is the following code:

<script src="js/N19S87N9NA9871X987ZZX.swf"></script>

The second element is:

write

Answer 4

这是混淆的javascript代码。参见Sample obfuscator

Answer 5

你说你正在学习JS，所以解释为什么你能在第22-24页的ECMA-262标准中找到它是什么http://www.ecma-international.org/publications/standards/Ecma-262 .htm因为数组的两个元素介于“所以它们是字符串文字。\\”被称为转义字符，\\ x必须后跟2个十六进制数字，意思是：“x HexDigit HexDigit是代码单位值的字符是（第一个HexDigit的MV的16倍）加上第二个HexDigit的MV“所以例如\\ x3C相当于'<'字符。