新建一个 dw.js文件

代码如下：

var fs = require('fs');
var request = require("request");

for (var i = 0; i < 500; i++) {
    let image = `http://www.xxxx.com/${i + 1}.png`

        var writeStream = fs.createWriteStream('./imgs/' + image.split('/').pop());
        var readStream = request(image)
        readStream.pipe(writeStream);
        readStream.on('end', function () {
            console.log('文件下载成功');
        });
        readStream.on('error', function () {
            console.log(1);
            // console.log("错误信息:" + err)
        })
        writeStream.on("finish", function () {
            console.log("文件写入成功");
            writeStream.end();
        });

}

最后执行 命令：  node    dw.js