Microsoft AJAX Library Cheat Sheet（6）：String和Object類型的擴充

本文為翻譯，英文原版的Cheat Sheet（PDF版本）在此下載：http://aspnetresources.com/downloads/ms_ajax_library_cheat_sheets1.zip

原作著作權聲明：

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註：標註有[S]的為靜態方法，無須執行個體化對象即可使用。

 

String.endsWith (suffix)

判斷該String是否以指定的尾碼結束。

var isTxt = myString.endsWith ("some_file.txt", ".txt");

// isTxt = true

 

[S] String.format (format, args)

將該String中的各個格式化項用相應的參數值替代。args可以為單一的Object，或是一個包含多個項的Array。

var user = {

    FirstName: 'John',

    LastName : 'Doe',

    DOB: new Date (1975, 1, 17) };

var label = String.format ("User name: {0} {1}, born {2:d}",

    user.FirstName, user.LastName, user.DOB));

// label = "User name: John Doe, born 02/17/1975"

 

[S] String.localeFormat (format, args)

功能與String.format (format, args)類似，不過格式化時與地區設定相關。

 

String.startsWith (prefix)

判斷該String是否以指定的首碼開始。請參考String.endsWith (suffix)。

 

String.trim ()

返回一個原String的拷貝，但將原String開頭和結尾部分的所有空白字元（例如空格或Tab）都移除。

var myString = "   A string   ";

myString = myString.trim();

// myString = "A string"

 

String.trimEnd ()

返回一個原String的拷貝，但將原String結尾部分的所有空白字元（例如空格或Tab）都移除。

var myString = "A string   ";

myString = myString.trim();

// myString = "A string"

 

String.trimStart ()

返回一個原String的拷貝，但將原String開頭部分的所有空白字元（例如空格或Tab）都移除。

var myString = "   A string";

myString = myString.trim();

// myString = "A string"

 

[S] Object.getType (instance)

返回指定對象的類型，請參考Object.getTypeName (instance)。

 

[S] Object.getTypeName (instance)

返回一個表示對象在運行時的完全限定類型的字串。

Type.registerNamespace("Samples");

// Define and register a Samples.Rectangle class.

Samples.Rectangle = function(width, height) {

    this._width = width;

    this._height = height;

}

Samples.Rectangle.registerClass("Samples.Rectangle");

var a = new Samples.Rectangle(200, 100);

var name = Object.getTypeName(a);

var type = Object.getType (a);

Sys.Debug.trace ("The type name of object \"a\" is: " + name);

Sys.Debug.traceDump (type);

/* The result is:

    The type name of object "a" is: Samples.Rectangle

    traceDump {Function}

    prototype {Samples.Rectangle}

        __typeName: Samples.Rectangle

        __class: true

*/