如何在Julia中检查字典中是否有关键字？

# 创建一个字典
dict = Dict("key1" => 1, "key2" => 2, "key3" => 3)

# 检查字典中是否存在指定的关键字
if haskey(dict, "key1")
    println("字典中存在关键字key1")
else
    println("字典中不存在关键字key1")
end

字典中存在关键字key1

# 创建一个字典
dict = Dict("key1" => 1, "key2" => 2, "key3" => 3)

# 检查字典中是否存在指定的关键字
if "key1" in keys(dict)
    println("字典中存在关键字key1")
else
    println("字典中不存在关键字key1")
end

字典中存在关键字key1