js发布订阅模式实现

//可以用于无相关页面或组件的事件、数据传递，减少在onShow中的业务，降低代码耦合

let events = {}

/**订阅**/

function on(name, self, callback) {

let tuple = [self, callback]

let callbacks = events[name]

if (Array.isArray(callbacks)) {

callbacks.push(tuple)

} else {

events[name] = [tuple]

}

}

/**取消订阅**/

function remove(name, self) {

let callbacks = events[name]

if (Array.isArray(callbacks)) {

events[name] = callbacks.filter((tuple) => {

return tuple[0] != self

})

}

}

/**发布**/

function emit(name, data) {

let callbacks = events[name]

if (Array.isArray(callbacks)) {

callbacks.map((tuple) => {

let self = tuple[0]

let callback = tuple[1]

callback.call(self, data)

})

}

}

module.exports = {

on,

remove,

emit

}