为何会打印三次呢？
var list2 = [4,5,6];
for(var item1 in list){
for(var item2 in list2){
print(item2);
}
}
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var list2 = [4,5,6];
for(var item1 in list){
for(var item2 in list2){
print(item2);
}
}
2019-05-22
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