/* obaa 1.0.0
 * By dntzhang
 * Github: https://github.com/Tencent/omi
 * MIT Licensed.
 */
;(function(win) {
  var obaa = function(target, arr, callback) {
    var _observe = function(target, arr, callback) {
      //if (!target.$observer) target.$observer = this
      var $observer = this
      var eventPropArr = []
      if (obaa.isArray(target)) {
        if (target.length === 0) {
          Object.defineProperty(target, '$observeProps', {
            configurable: true,
            enumerable: false,
            writable: true,
            value: {}
          })
          target.$observeProps.$observerPath = '#'
        }
        $observer.mock(target)
      }
      for (var prop in target) {
        if (target.hasOwnProperty(prop)) {
          if (callback) {
            if (obaa.isArray(arr) && obaa.isInArray(arr, prop)) {
              eventPropArr.push(prop)
              $observer.watch(target, prop)
            } else if (obaa.isString(arr) && prop == arr) {
              eventPropArr.push(prop)
              $observer.watch(target, prop)
            }
          } else {
            eventPropArr.push(prop)
            $observer.watch(target, prop)
          }
        }
      }
      $observer.target = target
      if (!$observer.propertyChangedHandler)
        $observer.propertyChangedHandler = []
      var propChanged = callback ? callback : arr
      $observer.propertyChangedHandler.push({
        all: !callback,
        propChanged: propChanged,
        eventPropArr: eventPropArr
      })
    }
    _observe.prototype = {
      onPropertyChanged: function(prop, value, oldValue, target, path) {
        if (value !== oldValue && this.propertyChangedHandler) {
          var rootName = obaa._getRootName(prop, path)
          for (
            var i = 0, len = this.propertyChangedHandler.length;
            i < len;
            i++
          ) {
            var handler = this.propertyChangedHandler[i]
            if (
              handler.all ||
              obaa.isInArray(handler.eventPropArr, rootName) ||
              rootName.indexOf('Array-') === 0
            ) {
              handler.propChanged.call(this.target, prop, value, oldValue, path)
            }
          }
        }
        if (prop.indexOf('Array-') !== 0 && typeof value === 'object') {
          this.watch(target, prop, target.$observeProps.$observerPath)
        }
      },
      mock: function(target) {
        var self = this
        obaa.methods.forEach(function(item) {
          target[item] = function() {
            var old = Array.prototype.slice.call(this, 0)
            var result = Array.prototype[item].apply(
              this,
              Array.prototype.slice.call(arguments)
            )
            if (new RegExp('\\b' + item + '\\b').test(obaa.triggerStr)) {
              for (var cprop in this) {
                if (
                  this.hasOwnProperty(cprop) &&
                  !obaa.isFunction(this[cprop])
                ) {
                  self.watch(this, cprop, this.$observeProps.$observerPath)
                }
              }
              //todo
              self.onPropertyChanged(
                'Array-' + item,
                this,
                old,
                this,
                this.$observeProps.$observerPath
              )
            }
            return result
          }
          target[
            'pure' + item.substring(0, 1).toUpperCase() + item.substring(1)
          ] = function() {
            return Array.prototype[item].apply(
              this,
              Array.prototype.slice.call(arguments)
            )
          }
        })
      },
      watch: function(target, prop, path) {
        if (prop === '$observeProps' || prop === '$observer') return
        if (obaa.isFunction(target[prop])) return
        if (!target.$observeProps){
          Object.defineProperty(target, '$observeProps', {
            configurable: true,
            enumerable: false,
            writable: true,
            value: {}
          })
        }
        if (path !== undefined) {
          target.$observeProps.$observerPath = path
        } else {
          target.$observeProps.$observerPath = '#'
        }
        var self = this
        var currentValue = (target.$observeProps[prop] = target[prop])
        Object.defineProperty(target, prop, {
          get: function() {
            return this.$observeProps[prop]
          },
          set: function(value) {
            var old = this.$observeProps[prop]
            this.$observeProps[prop] = value
            self.onPropertyChanged(
              prop,
              value,
              old,
              this,
              target.$observeProps.$observerPath
            )
          }
        })
        if (typeof currentValue == 'object') {
          if (obaa.isArray(currentValue)) {
            this.mock(currentValue)
            //为0，就不会进下面的 for 循环，就不会执行里面的 watch，就不会有 $observeProps 属性
            if (currentValue.length === 0) {
              if (!currentValue.$observeProps){
                Object.defineProperty(currentValue, '$observeProps', {
                  configurable: true,
                  enumerable: false,
                  writable: true,
                  value: {}
                })
              }
              if (path !== undefined) {
                currentValue.$observeProps.$observerPath = path + '-' + prop
              } else {
                currentValue.$observeProps.$observerPath = '#' + '-' + prop
              }
            }
          }
          for (var cprop in currentValue) {
            if (currentValue.hasOwnProperty(cprop)) {
              this.watch(
                currentValue,
                cprop,
                target.$observeProps.$observerPath + '-' + prop
              )
            }
          }
        }
      }
    }
    return new _observe(target, arr, callback)
  }

  obaa.methods = [
    'concat',
    'copyWithin',
    'entries',
    'every',
    'fill',
    'filter',
    'find',
    'findIndex',
    'forEach',
    'includes',
    'indexOf',
    'join',
    'keys',
    'lastIndexOf',
    'map',
    'pop',
    'push',
    'reduce',
    'reduceRight',
    'reverse',
    'shift',
    'slice',
    'some',
    'sort',
    'splice',
    'toLocaleString',
    'toString',
    'unshift',
    'values',
    'size'
  ]
  obaa.triggerStr = [
    'concat',
    'copyWithin',
    'fill',
    'pop',
    'push',
    'reverse',
    'shift',
    'sort',
    'splice',
    'unshift',
    'size'
  ].join(',')

  obaa.isArray = function(obj) {
    return Object.prototype.toString.call(obj) === '[object Array]'
  }

  obaa.isString = function(obj) {
    return typeof obj === 'string'
  }

  obaa.isInArray = function(arr, item) {
    for (var i = arr.length; --i > -1; ) {
      if (item === arr[i]) return true
    }
    return false
  }

  obaa.isFunction = function(obj) {
    return Object.prototype.toString.call(obj) == '[object Function]'
  }

  obaa._getRootName = function(prop, path) {
    if (path === '#') {
      return prop
    }
    return path.split('-')[1]
  }

  obaa.add = function(obj, prop) {
    var $observer = obj.$observer
    $observer.watch(obj, prop)
  }

  obaa.set = function(obj, prop, value, exec) {
    if (!exec) {
      obj[prop] = value
    }
    var $observer = obj.$observer
    $observer.watch(obj, prop)
    if (exec) {
      obj[prop] = value
    }
  }

  Array.prototype.size = function(length) {
    this.length = length
  }

  if (
    typeof module != 'undefined' &&
    module.exports 
  ) {
    module.exports = obaa
  } else if (typeof define === 'function' && define.amd) {
    define(obaa)
  } else {
    win.obaa = obaa
  }
})(Function('return this')())

@@ -1660,16 +1660,56 @@
 Value &&
+ (!(isNaN(value) && isNaN(oldValue))) &&
  this.pr

fix NaN === NaN is false, using isNaN