var testStr = '{"name":"will","age":18,"hobby":"football"}'
var jsonObj = JSON.parse(testStr)

var testObj = {
 "name": 'will',
 "age": '18',
 "hobby": 'football'
}
var jsonStr = JSON.stringify(testObj)

for (var l = 0; l < jsonArray.length; l++) {
 var jsonItem = jsonArray[l]
}

var testJSArray = [
 {"number": 'one'},
 {"number": "two"},
 {"number": "three"},
 {"number": "four"},
 {"number": "five"},
 {"number": "six"},
]
for(index in testJSArray){
 console.log("index:" + index + "; name:" + testJSArray[index].number)
}

var testJSArray01 = [
 {"name": 'one'},
 {"name": "two"},
 {"name": "three"},
]
var testJSArray02 = [
 {"name": "four"},
 {"name": "five"},
 {"name": "six"},
]
var testJSONMerge = testJSArray01.concat(testJSArray02)

var testObj = {
 "name": 'will',
 "age": '18',
 "hobby": 'football'
}
for (var key in testObj){
 console.log("key:" + key + ", value:" + testObj[key])
}

var writeStream = fs.createWriteStream(filePath);

return new Promise(function(resolve, reject) {
 writeStream.write("写入你需要的字符串内容");
 // 换行，如果是字符串中包含换行的字符，写入到.txt文件的时候并不能换行，需要输出换行符才行。
 writeStream.write("\n");
 // 格式化输出JSON字符串内容, JSONObj是要输出的JSON数据对象
 writeStream.write(JSON.stringify(JSONObj, null, "\t") + "\n");

 writeStream.end();
 writeStream.on('finish', () => {
 resolve(filePath);
 });
});

var filePath = 'xxx/xxx/test.json'
var fileContent = fs.readFileSync(filePath).toString();
var fileJson = JSON.parse(fileContent);

var processInfo = angular.fromJson('{"process":[]}');

var out = angular.toJson(jsonObj, true);

angular.forEach(jsonArray, function(jsonItem) {

});

jsonObj.hasOwnProperty("samples")