我有一个像下面这样的JSON对象，我想在数组中检索值而不需要传递密钥
var myData={
"VALUEX": "GrandTotal",
"VALUEX2": "GrandTotal",
"Jan-2018": 25,
"Feb-2018": 54.5,
"Mar-2018": 84,
"Apr-2018": 45.2,
"May-2018": 46,
"Jun-2018": 76.5,
"Jul-2018": 107,
"Aug-2018": 138,
"Sep-2018": 168.5,
"Oct-2018": 199,
"Nov-2018": 229.5,
"Dec-2018": 260
}