fetch请求结果中文乱码解决方案

// 方案1，IFrame

const iframe = document.createElement('iframe');
iframe.onload = async () => {
    console.log(iframe.contentWindow.document.title);
};
iframe.src = 'http://www.*****.com/';
iframe.style.top = '-9999em';
iframe.style.left = '-9999em';
iframe.style.visibility = 'hidden';
document.body.appendChild(iframe);

// 方案2，TextDecoder

const CHARTSET_RE = /(?:charset|encoding)\s{0,10}=\s{0,10}['"]? {0,10}([\w\-]{1,100})/i;

function charset(headers: Headers, html: string) {
    let matches: RegExpExecArray = null;
    // 先从header里面取
    const contentType = headers.get('content-type') ?? headers.get('Content-Type');
    if (contentType) {
        matches = CHARTSET_RE.exec(contentType);
    }
    // 再从html里面取
    if (!matches) {
        matches = CHARTSET_RE.exec(html);
    }
    // 返回结构
    let cs = '';
    if (matches) {
        cs = matches[1].toLowerCase();
        if (cs === 'utf-8') {
            cs = 'utf8';
        }
    }
    return cs;
}

fetch('http://www.****.com/').then(async response => {
    const buffer = await response.arrayBuffer();
    const utf8Decoder = new TextDecoder();
    const html = utf8Decoder.decode(buffer);
    const cs = charset(response.headers, html);
    const decoder = new TextDecoder(cs);
    const content = decoder.decode(buffer);
    const match = content.match(/<title>([\s\S]+?)<\/title>/ig);
    if (match) {
        const title = RegExp.$1;
        console.log(title);
    }
});