var event = {
items: {},
on: function (type, fn) {
if (!this.items[type]) {
this.items[type] = []
}
this.items[type].push(fn)
},
emit: function (type) {
for (var i in this.items) {
if (i == type) {
this.items[type].forEach(fn => fn())
}
}
},
off: function (type) {
if (type) {
delete this.items[type]
} else {
this.items = {}
}
}
}
var event = {
items: {},
on: function (type, fn)
阅读背景：
js发布订阅简洁版
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