Is there js function that replace xml Special Character with their escape sequence?

Question

I search the web alot and didn't find js function that replace xml Special Character with their escape sequence?
Is there something like this?

I know about the following:

Special Character   Escape Sequence Purpose  
&                   &           Ampersand sign 
'                   '          Single quote 
"                   "          Double quote
>                   >            Greater than 
<                   &lt;            Less than

is there more? what about writing hexadecimal value like 0×00,
Is this also a problem?

Answer 1

I have used this:

function htmlSpecialChars(unsafe) {
    return unsafe
    .replace(/&/g, "&")
    .replace(/</g, "&lt;")
    .replace(/>/g, "&gt;")
    .replace(/"/g, "&quot;")
    .replace(/'/g, "&apos;");
}