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var message = StringBuffer('Dart is fun');
for (var i = 0; i < 5; i++) {
message.write('!');
}
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如果不需要索引值，可以使用forEach()遍历：
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5
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var callbacks = [];
for (var i = 0; i < 2; i++) {
callbacks.add(() => print(i));
}
callbacks.forEach((c) => c());
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for-in语句：
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var collection = [0, 1, 2];
for (var x in collection) {
print(x); // 0 1 2
}
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二、while和do-while
while在循环体前判断：
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while (!isDone()) {
doSomething();
}
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do-while在循环体后判断：
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do {
printLine();
} while (!atEndOfPage());
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使用break停止循环：
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while (true) {
if (shutDownRequested()) break;
processIncomingRequests();
}
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使用continue跳过，继续下一次循环：
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for (int i = 0; i < candidates.length; i++) {
var candidate = candidates[i];
if (candidate.yearsExperience < 5) {
continue;
}
candidate.interview();
}
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