How to traverse Map objects in js

How to traverse Map objects in js

console.log(jsonData);//火狐控制台打印输出： Object { fileNumber="文件编号", fileName="文件名称"}
 
for(var key in jsonData)
  console.log("属性：" + key + ",值："+ jsonData[key]);
}

Printout:

Attribute: fileNumber, value: file number

Attribute: fileName, value: file name

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