看来您的
originalJson字符串缺少一些必要的转义。
我设法用重新添加的转义字符来验证签名：
var originalJson = '{"orderId":"GPA.1312-8694-0319-25069","packageName":"com.shihu.sm.testin","productId":"com.shihu.sm.testin.diamond","purchaseTime":1452598011176,"purchaseState":0,"developerPayload":"{\"iabProductId\":\"com.shihu.sm.testin.diamond\",\"gOrderId\":\"2cb77de1a2a94db18b6df84f8037ea5b\",\"serverId\":\"6\",\"productId\":\"202\"}","purchaseToken":"bjoncdcebeclpklebmadidgb.AO-J1OyEbKLL0rhWQAc1hjdWyJPXHkAoHZTfZasqUuFWKWyAlnj-opiDLYILNRpnWgcblO8vV37fWf0kpeNMRZcgRT-fRxAO4P8VQPmU-TJakB-sCiRx8sUxL4nxnUBMnZdFWdpaIZDW5tP3Ck4aO57n1o66PwnjZw"}';注意
\的。否则字符串是不同的。
