可写的依赖监控属性（双向数据绑定）
<p>firstName:<span data-bind="text:firstName"></span></p>
<p>lastName:<span data-bind="text:lastName"></span></p>
<p>fullName:<input type="text" name="fullName" data-bind="value:fullName"></p>
var ViewModel = function(){
var self = this;
this.firstName = ko.observable('Britney');
this.lastName = ko.observable('Spears');
this.fullName = ko.dependentObservable({
read:function(){
return this.firstName()+" "+this.lastName();
},
write:function(value){
var lastSpacePos = value.lastIndexOf(" ");
if(lastSpacePos > 0){
this.firstName(value.substring(0,lastSpacePos));
this.lastName(value.substring(lastSpacePos+1));
}
},
owner:self //ko调用read,write 的callback时用到的this,即read，write的callback中的this指向self
});
};
var myViewModel = new ViewModel();
ko.applyBindings(myViewModel);
监控数组（observableArray）
//声明监控数组
var myObservableArray = ko.sbservableArray()；
//向监控数组中添加数据
myObservableArray().push({name:'zhangsan'},age:20);
//声明的时候初始化数据
var myObservableArray = ko.observableArray([
{name:'zhangsan',age:18},
{name:'lisi',age:13},
{name:'wangwu',age:21},
{name:'zhaoliu',age:23},
]);
//读取监控数组的数据
alert(myObservableArray().length);
alert(myObservableArray()[0].name);
//ko提供的读取方法
1.indexOf()
2.slice()//等价与JS原生slice方法，返回给定的开始索引到结束索引之间的所有对象集合
var arr = myObservableArray().slice(1,myObservableArray().length);
alert(arr.length);//[{name:'lisi',age:13}, {name:'wangwu',age:21}, {name:'zhaoliu',age:23}]
3. myObservableArray.push({name:'朱元璋',age:(2016-1328)}) //在数组末尾添加一个新项
myObservableArray.pop() //删除数组最后一个项并返回该项
myObservableArray.unshift({name:'太祖',age:(2016-1893)}) //在数组头部添加一个项
var firstItem = myObservableArray.shift() //删除数组头部第一项并返回该项
myObservableArray.reverse() //翻转整个数组的顺序
myObservableArray.sort() //给数组排序
