关于while循环里嵌套for循环出现break的问题

[JackieChang_]

当for循环被嵌套在while循环里且 for循环里出现了break（且若该语句被执行到时），是否两个循环一同跳出，还是只跳出for循环，为什么？
var i = 0, finished = false;
while (i < seats.length && !finished) {
for (var j = 0; j < seats[i].length; j++) {
if (seats[i][j] && seats[i][j + 1] && seats[i][j + 2]) {
selSeat = i * seats[i].length + j;
document.getElementById("seat" + (i * seats[i].length + j)).src = "seat_select.png";
document.getElementById("seat" + (i * seats[i].length + j)).alt = "Your seat";
document.getElementById("seat" + (i * seats[i].length + j + 1)).src = "seat_select.png";
document.getElementById("seat" + (i * seats[i].length + j + 1)).alt = "Your seat";
document.getElementById("seat" + (i * seats[i].length + j + 2)).src = "seat_select.png";
document.getElementById("seat" + (i * seats[i].length + j + 2)).alt = "Your seat";
var accept = confirm("Seats " + (j + 1) + " through " + (j + 3) +
" in Row " + (i + 1) + " are available. Accept?");
if (accept) {
// The user accepted the seats, so we're done (break out of the inner loop)
finished = true;
break;
}
else {
// The user rejected the seats, so clear the seat selection and keep looking
selSeat = -1;
document.getElementById("seat" + (i * seats[i].length + j)).src = "seat_avail.png";
document.getElementById("seat" + (i * seats[i].length + j)).alt = "Available seat";
document.getElementById("seat" + (i * seats[i].length + j + 1)).src = "seat_avail.png";
document.getElementById("seat" + (i * seats[i].length + j + 1)).alt = "Available seat";
document.getElementById("seat" + (i * seats[i].length + j + 2)).src = "seat_avail.png";
document.getElementById("seat" + (i * seats[i].length + j + 2)).alt = "Available seat";
}
}//整个if语句的结束位置
}//for循环的结束位置

// Increment the outer loop counter
i++;
}//整个while循环的结束位置
——————代码源自head first javascript书籍

[Go 旅城通票]

break只跳出最近的一个循序（for或者while），你要退出用return，不要用break

[JackieChang_]

嗯 可是为什么建议使用return呢？

[erstens]

break跳出当前循环，如果不想用return结束方法，可以用开关来判断跳出外层循环

[天际的海浪]

只写break是跳出最近的一层循环。 可以为循环语句设置一个标识符。 用 break 标识符; 可以跳出指定的那一层循环

aa: for (var i = 0; i < 100; i++) {
	alert(1);
	while (true) {
		alert(2);
		break aa;
	}
	alert(3);
}
alert(4);

[JackieChang_]

问题解决了 大家提出的建议也让我学到了些新的知识 谢谢你们