js 文件下载，当前页下载，新标签下载____后端返回 GET/POST 文件流，下载文件

import axios from 'axios';

export default function (url, data = {}, method = 'GET', params, headers) {
    return new Promise((resolve, reject) => {
        let promise = null;
        if (method === 'GET') {
            promise = axios.get(url, {params: data, headers});
        } else if (method === 'POST') {
            promise = axios.post(url, data, {params: params, headers});
        }
        promise
            .then(response => resolve(response))
            .catch(err => {
                // console.log("/src/axios/ajax.js----error: "+err)
                reject(err);
            });
    });
}

1. 直接用 Ajax 发 POST/GET 请求

export const requestDownloadLabFile = (id) => { // 下载附件
    const url = preFixed + '/lab/myExperimentOperator/download/' + id;

    ajax(url, {}, 'GET', {}, {'labAuth': 'http://localhost:7000'}).then(res=> {
            const content = res.data;
            const blob = new Blob([content]);
            const fileName = 'fileName.type';
            if ('download' in document.createElement('a')) { // 非IE下载
                const elink = document.createElement('a');
                elink.download = fileName;
                elink.style.display = 'none';
                elink.href = URL.createObjectURL(blob);
                document.body.appendChild(elink);
                elink.click();
                URL.revokeObjectURL(elink.href); // 释放URL 对象
                document.body.removeChild(elink);
            } else { // IE10+下载
                navigator.msSaveBlob(blob, fileName);
            }
    });
    return 0;
}

form 当前页下载： (当 链接失效 时，影响当前页,)

export const diyDownload = (url, data, method = 'GET') => {
    const body = document.getElementsByTagName('body')[0];
    const form = document.createElement('form');
    form.method = method;
    form.action = url;
    for (let key in data) {
        let param = document.createElement('input');
        param.type = 'hidden';
        param.name = key;
        param.value = data[key];
        form.appendChild(param);
    }
    body.appendChild(form);
    form.submit();
    body.removeChild(form);
};


export const requestDownloadLabFile = (id) => { // 下载附件
    const url = preFixed + '/lab/myExperimentOperator/download/' + id;
    diyDownload(url, {}, 'GET');
};

 iframe 标签下载： (当 链接失效 时，不会影响当前页)

export const requestDownloadLabFile = (id) => { // 下载附件
    const url = preFixed + '/lab/myExperimentOperator/download/' + id;

    try {
        let elemIF = document.createElement('iframe');
        elemIF.src = url;
        elemIF.style.display = 'none';
        document.body.appendChild(elemIF);
    } catch (e) {
        myConsole('下载异常！');
    }
};