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：
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/*
##################### DO NOT MODIFY THIS HEADER #####################
# Title: StringBuilder Class #
# Description: Simulates the C# StringBuilder Class in Javascript. #
# Author: Adam Smith #
# Email: [email protected] #
# 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] = "\r\n";
}
// 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。
