for 循环

		var num = 1,
            cout = 0,
            result = 0;
        for (var i = 1; i <= num; i++) {
            num++;
            if (i % 3 == 0 && i % 7 == 0) {
                result = i;
                cout++;
            } else if (cout == 35) {
                break;
            }
        }
        console.log(result);

while循环

        var i = 1,
            count = 0,
            result = 0;
        while (count < 35) { 
            i++; 
            if (i % 3 == 0 && i % 7 == 0) {
                result = i; 
                count++; 
            }
        }
        console.log(result);