如何实现微信小程序url传值

onLoad: function (options) {
    var that = this;
    var id = options.id //获取值
    that.id = id
    var class_id = options.class_id
//在这个地方指定
    that.class_id = class_id
    var position = options.position
    that.position = position
    that.getSubject();
  },