//https://portal.qiniu.com/user/key

var accessKey = '-xxx-QvPiZzXYWY9AuytTjgix';

var secretKey = '-xxx';

var mac = new qiniu.auth.digest.Mac(accessKey, secretKey);

var options = {

  scope: "xxx"  //存储空间的名字，创建的存储空间的时候，自己取的名字

};

var putPolicy = new qiniu.rs.PutPolicy(options);

var uploadToken=putPolicy.uploadToken(mac);

router.get('/qiniu', function(req, res, next) {

	res.json({

		putPolicy:putPolicy,

		uploadToken:uploadToken

	})

});

<input type="file" name="files" id="files" value="" />

	$("#files").change(function(){

		var me = this;

		$.ajax({

		type:"get",

		url:"http://127.0.0.1:3000/qiniu",

		}).then(function(ret){

			var formData = new FormData(); // 构建表单数据

		    formData.append('token', ret['uploadToken']); // 设置accessid //

		    formData.append('file', me.files[0]); // 设置文件

		    upload(formData)

		}).fail(function(f){

			console.log("f")

		});

	});

	function upload(formData){

		//http(s)://upload.qiniup.com

		$.ajax({

        url: 'http://up-z2.qiniup.com',

        type: 'post',

        data: formData,

        contentType: false,

        processData: false,

        success: function (res) {

            console.info(res);

        },

        error: function (error) {

            console.info(error);

        }

    	})

	}