/********************************************************************* *                           依赖调度系统                             * **********************************************************************/var ronduplex = /^(duplex|on)$/function registerSubscriber(data) {    Registry[expose] = data //暴光此函数,方便collectSubscribers收集    avalon.openComputedCollect = true    var fn = data.evaluator    if (fn) { //如果是求值函数        try {            var c = ronduplex.test(data.type) ? data : fn.apply(0, data.args)            data.handler(c, data.element, data)        } catch (e) {            log("warning:exception throwed in [registerSubscriber] " + e)            delete data.evaluator            var node = data.element            if (node.nodeType === 3) {                var parent = node.parentNode                if (kernel.commentInterpolate) {                    parent.replaceChild(DOC.createComment(data.value), node)                } else {                    node.data = openTag + data.value + closeTag                }            }        }    }    avalon.openComputedCollect = false    delete Registry[expose]}function collectSubscribers(list) { //收集依赖于这个访问器的订阅者    var data =http://www.mamicode.com/ Registry[expose]    if (list && data && avalon.Array.ensure(list, data) && data.element) { //只有数组不存在此元素才push进去        addSubscribers(data, list)    }}function addSubscribers(data, list) {    data.$uuid = data.$uuid || generateID()    list.$uuid = list.$uuid || generateID()    var obj = {        data: data,        list: list,        toString: function() {            return data.$uuid + " " + list.$uuid        }    }    if (!$$subscribers[obj]) {        $$subscribers[obj] = 1        $$subscribers.push(obj)    }}var $$subscribers = [],        $startIndex = 0,        $maxIndex = 200,        beginTime = new Date(),        removeIDfunction removeSubscribers() {    for (var i = $startIndex, n = $startIndex + $maxIndex; i < n; i++) {        var obj = $$subscribers[i]        if (!obj) {            break        }        var data =http://www.mamicode.com/ obj.data        var el = data.element        var remove = el === null ? 1 : (el.nodeType === 1 ? typeof el.sourceIndex === "number" ?                el.sourceIndex === 0 : !root.contains(el) : !avalon.contains(root, el))        if (remove) { //如果它没有在DOM树            $$subscribers.splice(i, 1)            delete $$subscribers[obj]            avalon.Array.remove(obj.list, data)            //log("debug: remove " + data.type)            disposeData(data)            obj.data = obj.list = null            i--            n--        }    }    obj = $$subscribers[i]    if (obj) {        $startIndex = n    } else {        $startIndex = 0    }    beginTime = new Date()}function disposeData(data) {    data.element = null    data.rollback && data.rollback()    for (var key in data) {        data[key] = null    }}function notifySubscribers(list) { //通知依赖于这个访问器的订阅者更新自身    clearTimeout(removeID)    if (new Date() - beginTime > 444) {        removeSubscribers()    } else {        removeID = setTimeout(removeSubscribers, 444)    }    if (list && list.length) {        var args = aslice.call(arguments, 1)        for (var i = list.length, fn; fn = list[--i]; ) {            var el = fn.element            if (el && el.parentNode) {                if (fn.$repeat) {                    fn.handler.apply(fn, args) //处理监控数组的方法                } else if (fn.type !== "on") { //事件绑定只能由用户触发,不能由程序触发                    var fun = fn.evaluator || noop                    fn.handler(fun.apply(0, fn.args || []), el, fn)                }            }        }    }}