什么是||| 用JavaScript表示？

我用Google搜索并搜索了JavaScript文档,但我找不到任何提及此运算符的内容: a |?| b

当我自己尝试运算符时,我得到一个错误但是当我运行以下代码时它运行得非常好:

var a, b = 0; tex = '\u0076\u0061r'
var players, score = 0, x, y, z = 1;
function f(s) {
	var t = 0, r = 0;
    var js = 'window';
    while (t == r) {
    	if (t == 1) {
        	r = s.length;
            return false;
        } else {
        	t += 1;
        }  for (var i = 0; i < 20; i++) {
        	r = 20;i+=9000;eval(s); x = 50; y =+ 8;
            z = -20; y = s;
        }
        if (r < 20) {
        	return t + 2;
        }}
	    return true;
	} while (f(tex + ' \u01C0='+'0') && score < 900) {
	score = 9000.0001;}eval(y); a = 1; b += a;
	x = 50;{y =+ 8;
}

// testing:
document.writeln(false |?| false); // 0
document.writeln(false |?| true);  // 1
document.writeln(true  |?| false); // 1
document.writeln(true  |?| true);  // 1

false |?| false

false | undefined | false