识别移动设备脚本

var QVPL= {};
var pl = navigator.platform.toLowerCase();  		
var ipad = pl.match(/ipad/);  		
if (ipad) {  			
QVPL._clientPlatform = "ipad";  			
return true;  		
}	  		
var iphone = pl.match(/iphone/);
if (iphone) {  			
QVPL._clientPlatform = "iphone"; 
return true;  		
}  		
var ipod = pl.match(/ipod/);  		
if (ipod) {  			
QVPL._clientPlatform = "ipod";
return true;  		
}  		
return false;