条件控制
if 语句
// if 判断
var number = 1;
var isMax = true;
if (number > 0) {
isMax = true;
} else {
isMax = false;
}
for 语句
// for 循环
var list = [0, "val1", "val2", true, false];
for (var index = 0; index < list.length; index++) {
print(list[index]);
}
for (var item in list) {
print(item);
}
while 语句
// while 循环
var index = 0;
while (index < 5) {
index++;
print(index);
}
do {
index--;
print(index);
} while (index > 0);
break 和 continue
// break 和 continue
var list2 = [0, "val1", "val2", true, false];
for (var index = 0; index < list2.length; index++) {
if (index == 1) {
// 跳出当前循环体
break;
}
print(list[index]);
}
for (var index = 0; index < list2.length; index++) {
if (index == 1) {
// 跳出本次循环条件，继续执行其余循环
continue;
}
print(list[index]);
}
switch case 语句
// switch case 语句
// 比较类型：num，String，编译器常量，对象，枚举
var name = "Dart";
switch (name) {
case "Dart":
print("It is Dart");
break;
case "Java":
print("It is Java");
break;
default:
print("It is None");
break;
}
// 使用 continue 跳转标签
switch (name) {
Test1: // 给分支添加标签
case "Dart":
print("It is Dart");
// 跳转到指定标签；会执行标签的分支
continue Test3;
Test2:
case "Java":
print("It is Java");
break;
Test3:
default:
print("It is None");
break;
}
