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小游戏demorequestAnimationFrame传递了俩个参数，这是怎么回事，有知道的大佬说下呗
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还有第三个参数呢，你知不知道，下面是部分源码
var
documentCreateElement = document.createElement.bind(document)
requestAnimationFrame = window.requestAnimationFrame.bind(window)
cancelAnimationFrame = window.cancelAnimationFrame.bind(window)
_fpsInterval, RAFIdMap = {}, cid = 0
wxRequestAnimationFrame = (cb, id, last) => {
if
(!_fpsInterval)
return
requestAnimationFrame(cb)
(!id) {
id = cid++
}
(!last) {
last = +
new
Date()
nativeId = requestAnimationFrame(wxRequestAnimationFrame.bind(
this
, cb, id, last))
RAFIdMap[id] = nativeId
id
now = +
(now - last >= _fpsInterval) {
last = now - (last % _fpsInterval)
delete
RAFIdMap[id]
cb()
else
{
谢谢回复这么多，长见识了，这是官方自己增加的吧
还有第三个参数呢，你知不知道，下面是部分源码
vardocumentCreateElement = document.createElement.bind(document)varrequestAnimationFrame = window.requestAnimationFrame.bind(window)varcancelAnimationFrame = window.cancelAnimationFrame.bind(window)var_fpsInterval, RAFIdMap = {}, cid = 0varwxRequestAnimationFrame = (cb, id, last) => {if(!_fpsInterval)returnrequestAnimationFrame(cb)if(!id) {id = cid++}if(!last) {last = +newDate()varnativeId = requestAnimationFrame(wxRequestAnimationFrame.bind(this, cb, id, last))RAFIdMap[id] = nativeIdreturnid}varnow = +newDate()if(now - last >= _fpsInterval) {last = now - (last % _fpsInterval)deleteRAFIdMap[id]cb()}else{varnativeId = requestAnimationFrame(wxRequestAnimationFrame.bind(this, cb, id, last))RAFIdMap[id] = nativeIdreturnid}}谢谢回复这么多，长见识了，这是官方自己增加的吧