使用Python编写脚本来比较JSON文件的键值。

示例代码如下：

import json

def compare_json(file1, file2):
    with open(file1, 'r') as f1, open(file2, 'r') as f2:
        first_json = json.load(f1)
        second_json = json.load(f2)

    diff_keys = set(first_json.keys()) ^ set(second_json.keys())
    common_keys = set(first_json.keys()) & set(second_json.keys())

    for key in common_keys:
        if(first_json[key] != second_json[key]):
            print("Values are different for key: {}".format(key))

    print("Keys only in {} : {}".format(file1, set(first_json.keys()) - set(second_json.keys())))
    print("Keys only in {} : {}".format(file2, set(second_json.keys()) - set(first_json.keys())))

使用方法：

compare_json('file1.json', 'file2.json')

该脚本将会返回两个JSON文件中不同的键值，以及仅在一个文件中出现的键。