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function killErrors() {
    return true;
}
window.onerror = killErrors;

function a(){
try{
    if(event.ctrlKey){
   alertf("ctrl is down");//这里是故意写错的
}
}catch (e){
    alert(e)
}}

window.onerror=null;

window.onerror = function(message, url, line) 
{ 
alert("Error.\nMessage:"+ message +"\nUrl:" + url + "\nLine:" + line) 
return true; 
} 
test(); 
test(); 

function CreateError() 
{ 
throw new Error("Created error by custom."); 
} 
try 
{ 
//throw a error from a function just want to see the call stack in firefox. 
CreateError(); 
} 
catch(error) 
{ 
var errorMsg = ("Message: " + error.message + "\n"); 
if(typeof(error.stack)!=undefined) 
{ 
//FF 
errorMsg += ("Line Number: " + error.lineNumber + "\n"); 
errorMsg += ("File Name: " + error.fileName + "\n"); 
errorMsg += ("Stack Trace:\n" + error.stack + "\n"); 
} 
else 
{ 
//IE 
errorMsg += ("Description: " + error.description + "\n"); 
errorMsg += ("Number: " + error.number + "\n"); 
} 
alert(errorMsg); 
} 
finally 
{ 
//alert("End try catch.message from finally block."); 
} 

try 
{ //Syntax Error 
//eval("alert a"); 

//Custom Error 
throw new Error("An error occured."); 
} 
catch(error) 
{ 
if(error instanceof SyntaxError) 
{ 
alert("Syntax Error"); 
} 
else if(error instanceof EvalError) 
{ 
alert("Eval Error"); 
} 
else if(error instanceof RangeError) 
{ 
alert("Range Error"); 
} 
else if(error instanceof ReferenceError) 
{ 
alert("Reference Error"); 
} 
else if(error instanceof TypeError) 
{ 
alert("Type Error"); 
} 
else if(error instanceof Error) 
{ 
alert("Custon Error"); 
} 
alert(error.message); 
} 

function assert(bCondition, sErrorMsg) { 
　　 if (!bCondition) { 
　　 　　 alert(sErrorMsg); 
　　 　　 throw new Error(sErrorMsg); 
　　 } 
}