学步园

function check(s) {
	if (!/^\d{17}[\dxX]$/.test(s)) {
		alert('格式错误');
		return;
	}

	var a = "7 9 10 5 8 4 2 1 6 3 7 9 10 5 8 4 2".split(' ');
	var b = "1 0 X 9 8 7 6 5 4 3 2".split(' ');

	var n = 0;
	for (var i = 0; i