微信小程序里eventBus用法

eventBus.js文件

var events = {};
// 订阅
function on(name, self, callback) {
  var tuple = [self, callback];
  var callbacks = [];
  callbacks = events[name];
  if (Array.isArray(callbacks)) {
    callbacks.splice(name, 1)
    callbacks.push(tuple);
  }
  else {
    events[name] = [tuple];
  }
}
// 移除
function remove(name, self) {
  var callbacks = events[name];
  if (Array.isArray(callbacks)) {
    events[name] = callbacks.filter((tuple) => {
      return tuple[0] != self;
    })
  }
}
// 发出
function emit(name, data) {
  var callbacks = events[name];
  if (Array.isArray(callbacks)) {
    callbacks.map((tuple) => {
      var self = tuple[0];
      var callback = tuple[1];
      callback.call(self, data);
    })
  }
}

wx.$event = {
  on: on,
  remove: remove,
  emit: emit
};
exports = wx.$event;

挂载全局说明.png
然后需要在app.js里引用一下 全局引用.png

用法示例：

接收事件及移除事件.png 发出事件.png