js实现C#的StringBuilder效果完整实例

本文实例讲述了js实现C#的StringBuilder效果。分享给大家供大家参考，具体如下：

/*

##################### DO NOT MODIFY THIS HEADER #####################

# Title: StringBuilder Class #

# Description: Simulates the C# StringBuilder Class in Javascript. #

# Author: Adam Smith #

# Email: ibulwark@hotmail.com #

# Date: November 12, 2006 #

#####################################################################

*/

// Simulates the C# StringBuilder Class in Javascript.

// Parameter["stringToAdd"] - The string to add.

StringBuilder = function(stringToAdd)

{

var h = new Array();

if(stringToAdd){h[0] = stringToAdd;}

this.Append = Append;

this.AppendLine = AppendLine;

this.ToString = ToString;

this.Clear = Clear;

this.Length = Length;

this.Replace = Replace;

this.Remove = Remove;

this.Insert = Insert;

this.GetType = GetType;

// Appends the string representation of a specified object to the end of this instance.

// Parameter["stringToAppend"] - The string to append.

function Append(stringToAppend)

{

h[h.length] = stringToAppend;

}

// Appends the string representation of a specified object to the end of this instance with a carriage return and line feed.

// Parameter["stringToAppend"] - The string to append.

function AppendLine(stringToAppend)

{

h[h.length] = stringToAppend;

h[h.length] = "rn";

}

// Converts a StringBuilder to a String.

function ToString()

{

if(!h){ return ""; }

if(h.length<2){ return (h[0])?h[0]:""; }

var a = h.join('');

h = new Array();

h[0] = a;

return a;

}

// Clears the StringBuilder

function Clear()

{

h = new Array();

}

// Gets the StringBuilder Length

function Length()

{

if(!h){return 0;}

if(h.length<2){ return (h[0])?h[0].length:0; }

var a = h.join('');

h = new Array();

h[0] = a;

return a.length;

}

// Replaces all occurrences of a specified character or string in this instance with another specified character or string.

// Parameter["oldValue"] - The string to replace.

// Parameter["newValue"] - The string that replaces oldValue.

// Parameter["caseSensitive"] - True or false for case replace.

// Return Value - A reference to this instance with all instances of oldValue replaced by newValue.

function Replace(oldValue, newValue, caseSensitive)

{

var r = new RegExp(oldValue,(caseSensitive==true)?'g':'gi');

var b = h.join('').replace(r, newValue);

h = new Array();

h[0] = b;

return this;

}

// Removes the specified range of characters from this instance.

// Parameter["startIndex"] - The position where removal begins.

// Parameter["length"] - The number of characters to remove.

// Return Value - A reference to this instance after the excise operation has occurred.

function Remove(startIndex, length)

{

var s = h.join('');

h = new Array();

if(startIndex<1){h[0]=s.substring(length, s.length);}

if(startIndex>s.length){h[0]=s;}

else

{

h[0]=s.substring(0, startIndex);

h[1]=s.substring(startIndex+length, s.length);

}

return this;

}

// Inserts the string representation of a specified object into this instance at a specified character position.

// Parameter["index"] - The position at which to insert.

// Parameter["value"] - The string to insert.

// Return Value - A reference to this instance after the insert operation has occurred.

function Insert(index, value)

{

var s = h.join('');

h = new Array();

if(index<1){h[0]=value; h[1]=s;}

if(index>=s.length){h[0]=s; h[1]=value;}

else

{

h[0]=s.substring(0, index);

h[1]=value;

h[2]=s.substring(index, s.length);

}

return this;

}

// Gets the type

function GetType()

{

return "StringBuilder";

}

};

希望本文所述对大家JavaScript程序设计有所帮助。