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40 lines
988 B
40 lines
988 B
// 轻量事件总线（mitt 风格，零依赖），供跨组件通信使用
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// 使用方式：emitter.on('event', handler) / emitter.emit('event', payload) / emitter.off('event', handler)
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const eventMap = new Map()
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export const emitter = {
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on(type, handler) {
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const handlers = eventMap.get(type)
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if (handlers) {
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handlers.push(handler)
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} else {
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eventMap.set(type, [handler])
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}
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return this
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},
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off(type, handler) {
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const handlers = eventMap.get(type)
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if (!handlers) return this
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if (handler) {
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const index = handlers.indexOf(handler)
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if (index > -1) handlers.splice(index, 1)
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if (!handlers.length) eventMap.delete(type)
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} else {
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eventMap.delete(type)
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}
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return this
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},
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emit(type, evt) {
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const handlers = eventMap.get(type)
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if (handlers) {
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;[...handlers].forEach((fn) => fn(evt))
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}
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return this
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},
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clear() {
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eventMap.clear()
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return this
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},
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}
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export default emitter
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