Microsoft Ajax minifier Introduction

Microsoft Ajax minifier Introduction
Is a free tool for compressing JS and CSS files.
Http://aspnet.codeplex.com/releases/view/40584
Http://www.asp.net/ajaxLibrary/AjaxMinDocumentation.ashx
Reprinted please indicate the source: http://surfsky.cnblogs.com/

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Use
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Compress and overwrite source files
Ajaxmin inputfile. js

Compress to a new file (if the file already exists, an error is returned)
Ajaxmin inputfile. js-out outputfile. js

No error is reported when clobber is used to overwrite the target file.
Ajaxmin inputfile. js-out outputfile. js-clobber

By default, this tool renames all local variables and functions. If you do not want to change them, you can use the-Rename: None parameter.
Ajaxmin-Rename: None inputfile. js-out outputfile. js

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Compression Principle
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-Remove unnecessary spaces.
-Remove the remarks (ignore the remarks marked with "important)
-Remove unnecessary semicolons
-Remove curly-braces around most single-statement blocks.
-Rename local variables and functions
-Determine best string delimiters (single-or double-quotes) based on which option will generate the fewer escaped characters within the string.
-Merge multiple consecutive variable declarations.
-Delete null parameters in the constructor
-Remove unreferenced names for named function expressions.
-Delete A local function without reference
-Delete codes that cannot be reached

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Example
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Remove detachable spaces and semicolons
If (A = 0)
{
A = 10;
Alert (B/);
}
--->
If (A = 0) {A = 10; alert (B/)}

Remove brackets
If (A = 0)
{
A = 10;
}
--->
If (A = 0) A = 10;

Comprehensive
If (A = 0)
{
For (VAR o in opts)
{
If (O> 0)
{
A + = O;
}
}
}
Else
{
B = C/;
}
--->
If (A = 0) {for (VAR o in opts) if (O> 0) A + = O} else B = C/

Shrink string expression
VaR G = "What's his \" Name \"? ";
--->
VaR G = 'what \'s his "name "? '

Variable reduction Declaration
VaR a = 0;
VaR B = "some string ";
VaR c = 3.14;
--->
VaR a = 0, B = "some string", c = 3.14;

Simplified constructor expression
VaR IMG = new image ();
-->
VaR IMG = new image;

Simplify new code
VaR OBJ = new object ();
VaR arr = new array ();
VaR lst = new array (1, 2, 3 );
-->
VaR OBJ = {}, arr = [], LST = [1, 2, 3];

Merge variable Declaration
Function Foo (P)
{
VaR F = 10;
{
VaR G = 0;
F = p * g;
}
}
-->
Function Foo (p) {var F = 10, G = 0; F = p * g}

Remove Invalid logical branches
If (A> = B) {} else {alert ("! = B ")}
If (FOO. Bar () {} else {alert ("not Foo. Bar ()")}
If (! A) {} else {alert ("")}
-->
If (A <B) Alert ("! = B ");
If (! Foo. Bar () Alert ("not Foo. Bar ()");
If (a) Alert ("");

Move the variables used by the for loop to the for expression.
Example 1:
VaR I = 5;
For (; I> 0; -- I)
{
Alert (I );
}
-->
For (VAR I = 5; I> 0; -- I) Alert (I)
Example 2:
VaR n = 10;
For (VAR I = 5; I> 0; -- I)
{
N * = I;
}
-->
For (VAR n = 10, I = 5; I> 0; -- I) N * = I
Example 3:
VaR n = 10, I;
For (I = 5; I> 0; -- I)
{
N * = I;
}
-->
For (VAR n = 10, I = 5; I> 0; -- I) N * = I
Example 4:
VaR I;
For (I = 5, n = 10; I> 0; -- I)
{
N * = I;
}
-->
VaR I; for (I = 5, n = 10; I> 0; -- I) N * = I
Because the N variable being assigned to is not part of the preceding var statement, and cocould possibly be a different context if placed into a var construct.

Simplified method call
If (obj. Method)
{
OBJ. Method ();
}
-->
OBJ. Method & obj. Method ()

Simplify property calls
If (obj. Prop)
{
I + = obj. Prop;
}
-->
OBJ. Prop & (I + = obj. Prop)
If (obj. Prop) I + = obj. Prop

Rename the local method name and Parameter Name
Function dividetwonumbers (numerator, denominator, unsedparameter)
{
Return numerator/denominator;
}
Function A (a, B) {return a/B}

Extract repeated Variables
Function Foo (P)
{
P [0]. style. Display = "Block ";
P [1]. style. Display = "Block ";
P [2]. style. Display = "Block ";
P [3]. style. Display = "Block ";
P [4]. style. Display = "Block ";
}
-->
Function Foo (p) {var A = "Block"; P [0]. style. display = A; P [1]. style. display = A; P [2]. style. display = A; P [3]. style. display = A; P [4]. style. display =}

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Programming Interface
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Namespace
Using Microsoft. Ajax. utilities;

Jsparser
// Create the parser from the source string.
// Pass NULL for the assumed globals Array
Jsparser parser = new jsparser (source, null );
String minified;

// Hook the engine error event
Parser. compilererror + = new compilererrorhandler (oncompilererror );
Try
{
// Parse the input
Block scriptblock = parser. parse (settings );
If (scriptblock! = NULL)
{
// We'll return the minified code
Minified = scriptblock. tocode ();
}
}
Catch (jscriptexception E)
{
// Other error handling
}

CSS
Cssparser parser = new cssparser ();
Parser. csserror + = new eventhandler <csserroreventargs> (oncsserror );
Parser. filecontext = sourcefilename;
String crunchedstyles = parser. parse (source );