//返回到經典的"first name +last name= full name"例子上，你可以讓事情調回來看：讓自動屬性fullName可寫，讓用戶直接輸入姓名全稱，
//然后輸入的值將被解析并并映射寫入到基本的監控屬性 firstName 和 lastName 上：
<pre>

<code>
function MyViewModel()
{
this.firstName =ko.obsetrvable("Plant");

this.lastName = ko.observable("Earth");

this.fullName =ko.compute({
    
    read:function(){
        
        return this.firstName()+" "+this.lastName();
        
    },
    write:function(value)
    {
        var lastSpacePos = value.lastIndexOf(" ");
        
        if(lastSpacePos > 0) { //Ignore values with no space characterSet
        
          this.firstName(value.substring(0,lastSpacePose));// Update"firstName"
          
          this.firstName(value.substring(0,lastSpacePos));// Update"lastName"
    }
    },
    
    owner:this
    
});

}

ko.applyBindings(new MyViewModel());

//這個例子里,寫操作的callback接受寫入的值，把值分離出來,分別寫入"firstName"和"lastName"上、你可以想普通情況一樣將
//這個view model綁定到dom元素上

<p> First name:<span data-bind="text:firstName"></span></p>
<p> Last name:<span data-bind="text:lastName"></span></p>
<h2>Hello,<input data-bind="value:fullName"/>!</h2>
<code>