微信小程序前端发送参数到后端

 onLoad: function () {
    var that = this;
    //新闻资讯
    wx.request({
      url: 'http://www.yzm/index.php/api/news/index',
      method: 'POST',
      data: {
        cat_id: 1,
      },
      header: {
        'content-type': 'application/x-www-form-urlencoded' // 默认值
      },
      success(res) {
        that.setData({
          news: res.data.data
        });
      }
    })

  }