JavaScript转义序列

Question

I am currently trying to translate a short bit of JavaScript code into Java. But since I never did anything with JavaScript, I have trouble translating this line:

key += "\x720\\x78X";

Can someone help me understanding or translating this?

Answer 1

Honestly, it is hard to say because that line seems incorrect: it is trying to append characters to the existing value stored in key by using Hexadecimal escape sequences , but only 2 digits are allowed in a hex sequence, so "\\x720\\\\x78X" is translated to "r0\\x78X" :

"\\x72" is "r" then, you have "0" , then there is a escaped inversed slash "\\\\" , that means "\\" and then you have "x78X"

If you write "\\x72\\x78" you will obtain "rx"

I hope this helps you to understand that piece of code...