原生Javascript使用fetch发起请求_模拟get|post|文件流下载等_base64文件流字符串转blob下载

　　有时候，我们无法借助熟悉的jquery发起请求，原生JS里是支持fetch函数的，这是个高度封装的方法，帮助我们做了很多底层的封装，下面列举一些发起请求的示例：

 

　　1-发起Get请求：

//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;
    };

 

　　2-发起Get文件流-支持设置保存文件名-下载：

    //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) => {

        });
    };

 

　　3-将base64字符串转blob下载excel：

var dataURLtoBlob = function (baseData,dataFileType) {
    var bstr = atob(baseData)
    var n = bstr.length;
    var u8arr = new Uint8Array(n);
    while (n--) {
        u8arr[n] = bstr.charCodeAt(n);
    }
    return new Blob([u8arr], { type: dataFileType });
};

var base64FileStr="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