var request = require("request");

var options = { method: 'POST',
url: 'https://gzmss.iok.la/api/v2/users/signin',
headers:
{
'content-type': 'application/x-www-form-urlencoded' },
form: { user_name: 'yeungy', password: '123456' } };

request(options, function (error, response, body) {
if (error) throw new Error(error);

console.log(body);
});