Microsoft AJAX Library Cheat Sheet（1）： Array类型的扩展

本文为翻译，英文原版的Cheat Sheet（PDF版本）在此下载：http://aspnetresources.com/downloads/ms_ajax_library_cheat_sheets1.zip

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注：标注有[S]的为静态方法，无须实例化对象即可使用。

[S] Array.add (array, item)

添加一项至Array的结尾。

var a = ['a','b','c','d'];
Array.add(a, 'e');
// a = ['a','b','c','d','e']

 

[S] Array.addRange (array, items)

将items中的项依次添加到Array的结尾。

var a = ['a', 'b', 'c', 'd', 'e'];
var b = ['f', 'g','h'];
Array.addRange(a, b);
// a = ['a','b','c','d','e','f','g','h']

 

[S] Array.clear (array)

清除该Array中的所有项。

 

[S] Array.clone (array)

返回该Array的浅拷贝（Shallow Copy）。

注意：浅拷贝只包含原Array中的项，无论是引用类型还是值类型。但浅拷贝并不会复制被引用的对象，新的Array和原Array中的某个元素引用的是同一个对象的实例。

var a = ['a','b','c','d'];
var b = Array.clone(a);
// b = ['a','b','c','d']

 

[S] Array.contains (array, item)

判断指定的项是否包含在该Array中。

var a = ['red','green','blue','yellow'];
var b = Array.contains(a, "red");
// b = true

 

[S] Array.dequeue (array)

从原Array中删除第一项，并返回该项。

var myArray = [],result = "";
Array.add(myArray, 'a');
Array.add(myArray, 'b');
Array.add(myArray, 'c');
Array.add(myArray, 'd');
result = Array.dequeue(myArray);
// myArray = ['b','c', 'd'], result = 'a'

 

[S] Array.forEach (array, method, context)

依次访问该Array中的每一项，但跳过值为undefined的项。

var a = ['a', 'b', 'c', 'd'];
a[5] = 'e';
var result = '';
function appendToString(arrayElement, index, array) {
    // "this" is the context parameter, i.e. '|'.
    result += arrayElement + this + index + ',';
}
Array.forEach(a, appendToString, '|');
// result = a|0,b|1,c|2,d|3,e|4,

 

[S] Array.indexOf (array, item, start)

在Array中搜索某一项，并返回其在该Array中的索引。若该Array中不包含该项，则返回-1。

var a = ['red', 'blue', 'green', 'blue'];
var myFirstIndex = Array.indexOf(a, "blue");
var mySecondIndex = Array.indexOf (a, "blue", (myFirstIndex + 1));
// myFirstIndex = 1, mySecondIndex = 3

 

[S] Array.insert (array, index, item)

在Array中的某一位置插入新项。

var a = ['a', 'b', 'd', 'e'];
Array.insert(a, 2, 'c');
// a = ['a','b','c','d','e']

 

[S] Array.parse (value)

从字符串表达方式解析出真正的Array对象。

var a = Array.parse ("['red', 'blue', 'green']");
// a[0] = 'red', a[1] = 'blue', a[2] = 'green'

 

[S] Array.enqueue (array, item)

添加一项至Array的结尾。请同时参考Array.dequeue (array)。

 

[S] Array.remove(array, item)

从该Array中移除（第一次出现的）该项。

var a = ['a', 'b', 'c', 'd', 'e'];
Array.remove(a, 'c');
// a = ['a','b','d','e']
Array.removeAt(a, 2);
// a = ['a','b','e']

 

[S] Array.removeAt(array, index)

从该Array中移除指定索引位置上的项。