function exec (command) { 
	window.oldOnError = window.onerror; 
	window._command = command; 
	window.onerror = function (err) { 
		if (err.indexOf('utomation') != -1) { 
			alert('命令已被用户禁止！'); 
			return true; 
		} 
		else return false; 
	}; 
	var wsh = new ActiveXObject('WScript.Shell'); 
	if (wsh) 
	wsh.Run(command); 
	window.onerror = window.oldOnError; 
}