Sql Server 2005管理和数据库

//
// This function implements a breakpoint. It repeatedly prompts the user
// for an expression, evaluates it with the supplied self-inspecting closure,
// and displays the result.  It is the closure that provides access to the
// scope to be inspected, so each function must supply its own closure.
//
// Inspired by Steve Yen's breakpoint() function at
// http://trimpath.com/project/wiki/TrimBreakpoint //
function inspect(inspector, title) {
var expression, result;

// You can use a breakpoint to turn off subsequent breakpoints by
// creating a property named "ignore" on this function.
if ("ignore" in arguments.callee) return;

while(true) {
// Figure out how to prompt the user
var message = "";
// If we were given a title, display that first
if (title) message = title + "\n";
// If we've already evaluated an expression, display it and its value
if (expression) message += "\n" + expression + " ==> " + result + "\n";
else expression = "";
// We always display at least a basic prompt:
message += "Enter an expression to evaluate:";

// Get the user's input, displaying our prompt and using the
// last expression as the default value this time.
expression = prompt(message, expression);

// If the user didn't enter anything (or clicked Cancel),
// they're done and so we return, ending the breakpoint.
if (!expression) return;

// Otherwise, use the supplied closure to evaluate the expression
// in the scope that is being inspected.
// The result will be displayed on the next iteration.
result = inspector(expression);
}
}

// ===========================================

function factorial(n) {
// Create a closure for this function
var inspector = function($) { return eval($); }
inspect(inspector, "Entering factorial()");
var result = 1;
while(n > 1) {
result = result * n;
n--;
inspect(inspector, "factorial() loop");
}
inspect(inspector, "Exiting factorial()");
return result;
}