普通数组，与Knockout数组关联，Knockout数组与select元素关联。
于是，你用Knockout内置函数，处理了Knockout数组，普通数组也随着改变，select元素随着改变。
你改变了select元素，Knockout数组随着改变，普通数组随着改变。
你通过内置函数改变了普通数组，Knockout数组改变， select元素改变。
这就是MVVM，普通数组是Model，Knockout数组是View-Model，select元素是View。
但是，你重新绑定了，就另当别论了。
<!DOCTYPE html>
<html>
<head>
<script type="text/javascript" src="jquery.js"></script>
<script type="text/javascript" src="knockout-2.0.0.debug.js"></script>
<script type="text/javascript">
$(function(){
var testKo=function(){
this.testArray=["1","2","3","4","5"];
this.koArray =ko.observableArray([]);
this.koArray(this.testArray);
console.log("knockout array is "+this.koArray());
this.koArray(["6","7"]);//rebind
console.log("normal array is "+this.testArray);//origin nomral array
this.testArray.push("8");
console.log("knockout array is " + this.testArray);
this.testArray = ["44"];
console.log("kockout array is "+this.koArray());
this.testArray.push("55");
console.log("knockout array is " + this.koArray());
//restart
this.newArray = ["aa","bb","cc"];
this.newKoArray = ko.observableArray(this.newArray);
console.log(this.newKoArray());
this.newArray.push("dd");
console.log(this.newKoArray());
this.newKoArray.remove("aa");
console.log(this.newArray);
}
ko.applyBindings(new testKo());
})
;
</script>
</head>
<body>
</body>
</html>
<html>
<head>
<script type="text/javascript" src="jquery.js"></script>
<script type="text/javascript" src="knockout-2.0.0.debug.js"></script>
<script type="text/javascript">
$(function(){
var testKo=function(){
this.testArray=["1","2","3","4","5"];
this.koArray =ko.observableArray([]);
this.koArray(this.testArray);
console.log("knockout array is "+this.koArray());
this.koArray(["6","7"]);//rebind
console.log("normal array is "+this.testArray);//origin nomral array
this.testArray.push("8");
console.log("knockout array is " + this.testArray);
this.testArray = ["44"];
console.log("kockout array is "+this.koArray());
this.testArray.push("55");
console.log("knockout array is " + this.koArray());
//restart
this.newArray = ["aa","bb","cc"];
this.newKoArray = ko.observableArray(this.newArray);
console.log(this.newKoArray());
this.newArray.push("dd");
console.log(this.newKoArray());
this.newKoArray.remove("aa");
console.log(this.newArray);
}
ko.applyBindings(new testKo());
})
;
</script>
</head>
<body>
</body>
</html>