How to understand Ternary JavaScript expression?

I’m bad with JS at now, especially with the operator "?"

And I’m trying to understand the following code.

Maybe it could be more friendly ?

So, if I don’t want to use this operator, how can it be looks.

JavaScript code:

function(t) {
       for (var e, r = t.length, n = "", i = 0, s = 0, a = 0; i < r; )
           (s = t.charCodeAt(i)) < 128 ? (n += String.fromCharCode(s),
           i++) : s > 191 && s < 224 ? (a = t.charCodeAt(i + 1),
           n += String.fromCharCode((31 & s) << 6 | 63 & a),
           i += 2) : (a = t.charCodeAt(i + 1),

           e = t.charCodeAt(i + 2),
           n += String.fromCharCode((15 & s) << 12 | (63 & a) << 6 | 63 & e),
           i += 3);
       return n
   }

>Solution :

It seems like this is same as:

function(t) {
       for (var e, r = t.length, n = "", i = 0, s = 0, a = 0; i < r; )
           if((s = t.charCodeAt(i)) < 128) {
              n += String.fromCharCode(s);
              i++;
           } else if(s > 191 && s < 224) { 
              a = t.charCodeAt(i + 1);
              n += String.fromCharCode((31 & s) << 6 | 63 & a);
              i += 2;
           } else {
              a = t.charCodeAt(i + 1);
              e = t.charCodeAt(i + 2);
              n += String.fromCharCode((15 & s) << 12 | (63 & a) << 6 | 
              63 & e);
              i += 3;
           }
       return n
   }