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????backbone??hash???????
??????????????backbone????????bk???У????????route.navigate????????·????????bk????????????hash???????滻??????е?hash?????????loadUrl?????????ж???????·?????????л??????????????????????′???
????route.navigate??????????????--->_updateHash?????μ?????е?url??->loadUrl???????ж??????·???????->callback????л???????;
??????????????????????????????????????????????????js????url????????????????ж????onhashchange?????????????????????start????????????popstate?????????????????????????bk??????????????μ?????????????????????????????????????hash???仯????????????????????????hash??????仯??????????????????￡??????????????url?仯??????????????????????????????????????????????μ????
????back/forward??????????????????------>onhashchange??????hash??仯??----->checkUrl(???loadUrl?????url???÷?????????????????????????????????return)---->loadUrl??????????????????·??????---->callback(?????????????);
??????ж????????????????????ios9????????????????????????????????????????????????????????????????????url??????????????????url???????μ??
????????????
??????????????????????????google??????????????????????????С??????????bug????????github???????????????2?ios9????????bk????anglar????????????????????hash???????????????е?????????????????????????????β????????????????±???????????????ios9?????????????????????????????????????????????_updateHash???????????:

??????????????????????????????????????????hash???仯?????ios9????9~30ms???????ε?alert????????????????????????????????????>30ms?????С??????loadUrl???????50ms??50ms??????????????????????????????????Щ??г???????????????????????????????????1599?????????????????????:
????if (options.trigger) {
????var self = this;//this????????????
????setTimeout(function(){//???50ms???
????return self.loadUrl(fragment);
????}?? 50);
????}
???????????????????????????????????????
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