我有一个json
{
name1：value1，
name2：value2，
name3：value3，
name4：value4，
name5：value5
}
我拿到了一个新数据：newName 和NewValue
请问怎么把新数据newName 和NewValue添加到上面的Json中
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json["newName "] = NewValue 这样就加一条了
先把json反序列化，然后再把对应key和value赋值，最后序列化；