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每次我运行这段代码：

async function Summoner_V4(region, summonerName) {
    const url = `https://${region}.api.riotgames.com/lol/summoner/v4/summoners/by-name/${summonerName}?api_key=${api_key}`;
    const response = await fetch(url);
    const data = await response.json();
    return data
}

我得到 3 个错误。

错误一：

Access to fetch at 'https://euw1.api.riotgames.com/lol/summoner/v4/summoners/by-name/Monkvy?api_key={myapikey}' from origin 'null' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource. If an opaque response serves your needs, set the request's mode to 'no-cors' to fetch the resource with CORS disabled.

错误2：

Failed to load resource: net::ERR_FAILED

错误 3：

Uncaught (in promise) TypeError: Failed to fetch

请heeeelp 我不知道该怎么办

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