写一个js脚本将export jiaocheng_data这个变量里的东西用base64方式连续解码3次

const jiaocheng_data = "VGhpcyBpcyBhIHRlc3QgZnJvbSBqYW9vY2hlbmcgdGhhdCBiYXNlNjQgd2FzIGJhc2U2NCBlbmNvZGVkIGZvciB0aGUgdGVzdCB2YWx1ZSBhbmQgc3RyaW5n"; let decodedData = atob(jiaocheng_data);

for (let i = 0; i < 3; i++) { decodedData = atob(decodedData); }

console.log(decodedData); // This is a test from jaoocheng that base64 was base64 encoded for the test value and string