@JasonL
Thank you!!

@Paul-Winterhalder
actually i've tried "1" too.
the result is
sampleData[1] and sampleData["1"] are both OK,
data[1] and data["1"] both returned Undefined.
wondering why...

hello, i did some experiment as below.
i defined a sample data which is exactly the same as data inputed.
wondering why data[1] returns "undefined" but sampleData[1] is OK?

Input Parameters

{
  "scriptName": "KeyTest",
  "scriptData": {
    "1": {"ID":1},
    "2": {"ID":2}
  }
}

Test Script

// get log service
var logService = bridge.getLogServiceProxy();

var sampleData = {
    "1": {"ID":1},
    "2": {"ID":2}
  };
logService.logInfoJson("sampleData" , sampleData);
logService.logInfoJson("sampleData[1]" , sampleData[1]);

logService.logInfoJson("data" , data);
logService.logInfoJson("data[1]" , data[1]);

result