JavaScript生成GUID

function newGuid()
				{
				    var guid = "";
				    for (var i = 1; i <= 32; i++){
				      var n = Math.floor(Math.random()*16.0).toString(16);
				      guid +=   n;
				      if((i==8)||(i==12)||(i==16)||(i==20))
				        guid += "-";
				    }
				    return guid;    
				}