javascript - How to use the character "+" as a real plus sign

Question

x = "-";
console.log("5" + x + "" + "2");

Answer 1

var x = '-'
console.log(new Function('return ' + "5" + x + "" + "2")())

Answer 2

x = '-'; eval(Number(5) + x + '' + Number(4))

Try this

x = '-'; eval('5' + x + '' + '4')

This is also possible

Answer 3

Complain about where this demand comes from and try to avoid this kind of strange demand

Upstairs is a practice

I provide another one here
'1+1'.match(/([0-9]+)(-|+)([0-9]+)
The specific idea is to use regular expressions to match numbers and operators, and then use switch to match the operators to return different results

In addition, if the questioner is studying, I still don’t recommend this weird approach. No one will like this way of writing