如何将特殊字符从<input>进入转义序列

Question

I'm writing a barcode application whereby the user has the ability to specify termination characters.

Consider the following:

<input id="terminators" type="text" value="\n" />

When I read the value from the input, the escape sequence \\n is returned as two individual characters \\ and n . Whereas I need it as one \\n (ASCII character 10) .

You can reproduce this issue the browsers console:

document.getElementById('terminators').value.charCodeAt(0) === '\n'.charCodeAt(0);

Answer 1

Figured it out. The value of an input is escaped with an additional \\ , so \\n becomes \\\\n :

We can validate this using the following test:

document.getElementById('terminators').value.charCodeAt(0) === '\\n'.charCodeAt(0)

https://jsfiddle.net/v9b348z3/