javascript使用fetch模拟请求响应内容GBK中文汉字乱码

fetch('请求网址',
{
    method: 'GET|POST', 
    headers: {
        'Content-Type': 'application/json'
        // 'Content-Type': 'application/x-www-form-urlencoded',
    },
    body: JSON.stringify(data),
    credentials: 'include'
})
.then(response => response.blob())
.then(data => {
    let reader = new FileReader();
    reader.onload = () => {
        let text = reader.result;
        console.log(text);
    }

    reader.readAsText(data, 'GBK');
 })
 .catch(error => {
     console.log(error);
 });