JavaScript在内层循环中断外层循环

很少见的用法……

var elem1 = [1,2,3,5,6];
var elem2 = [7,5,0];

label1 : {
    for (var i = 0; i < 10; i++) {
        for (var j = 0; j < 10; j++) {
            if (elem1[i] == elem2[j]) {
                break label1;
            }
        }
    }
}