原生Javascript使用fetch发起请求_模拟get|post|文件流下载等

//httpGet请求
    var httpGet = async function (getUrl) {
        var opts = {
            method: "GET",
            credentials: ‘include‘ // 强制加入凭据头
        }
        await fetch(getUrl, opts).then((response) => {
            return response.text();
        }).then((responseText) => {
            result = responseText;
        }).then((error) => {

        });
        return result;
    };

    //执行httpGet下载
    var httpDownLoadFile = async function (getUrl, fileName) {
        var opts = {
            method: "GET",
            credentials: ‘include‘ // 强制加入凭据头
        }
        await fetch(getUrl, opts).then((response) => {
            return response.blob();
        }).then((blob) => {
            var url = window.URL.createObjectURL(blob);
            var a = document.createElement(‘a‘);
            a.href = url;
            a.download = fileName;
            a.click();
            window.URL.revokeObjectURL(url);
        }).then((error) => {

        });
    };