aaac7fed
 liuqimichale
add
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
|
export function eventMixin(BScroll) {
BScroll.prototype.on = function (type, fn, context = this) {
if (!this._events[type]) {
this._events[type] = []
}
this._events[type].push([fn, context])
}
BScroll.prototype.once = function (type, fn, context = this) {
function magic() {
this.off(type, magic)
fn.apply(context, arguments)
}
// To expose the corresponding function method in order to execute the off method
magic.fn = fn
this.on(type, magic)
}
BScroll.prototype.off = function (type, fn) {
let _events = this._events[type]
if (!_events) {
return
}
let count = _events.length
while (count--) {
if (_events[count][0] === fn || (_events[count][0] && _events[count][0].fn === fn)) {
_events[count][0] = undefined
}
}
}
BScroll.prototype.trigger = function (type) {
let events = this._events[type]
if (!events) {
return
}
let len = events.length
let eventsCopy = [...events]
for (let i = 0; i < len; i++) {
let event = eventsCopy[i]
let [fn, context] = event
if (fn) {
fn.apply(context, [].slice.call(arguments, 1))
}
}
}
}
|
