JavaScript数据不附加到数组

I have an object of values and I am trying to populate two arrays with the keys and values from the object.

我有一个值的对象,我试图用对象的键和值填充两个数组。

My Object:

obj = {19455746: 7476, 22489710: 473}

Loop attempting to append data:

循环尝试追加数据:

var sensorNameArray = [];
var sensorDataArray = [];
for(var i in obj) {
  sensorNameArray.push[i];
  sensorDataArray.push[obj[i]];
}

At the moment the two arrays are printing out as empty. My expected outout would be something like:

目前,两个阵列打印为空。我的预期结果将是这样的:

sensorNameArray = [19455746, 22489710];
sensorDataArray = [7476, 473];

5 个解决方案

#1

The syntax push[] doesn't invoke the function, it tries to access a property of the function object. It doesn't throw an error because in Javascript, functions ARE objects and this syntax is technically valid.

语法push []不调用该函数,它尝试访问函数对象的属性。它不会抛出错误,因为在Javascript中,函数是ARE对象,这种语法在技术上是有效的。

So, just fix the syntax to push() in order to actually invoke the function.

因此,只需将语法修复为push()即可实际调用该函数。

#2

push is a function, not an array, it uses parenthesis not brackets :

push是一个函数,而不是一个数组,它使用括号而不是括号:

for(var i in obj) {
    sensorNameArray.push(i);
    sensorDataArray.push(obj[i]);
}

#3

You are using square braces [] but array.push() is a function so use circle braces instead

你正在使用方括号[]但是array.push()是一个函数,所以请使用圆括号

Try the following code

请尝试以下代码

   obj = {19455746: 7476, 22489710: 473};
    var sensorNameArray = [];
    var sensorDataArray = [];
    for(var i in obj) {
      sensorNameArray.push(i);
      sensorDataArray.push(obj[i]);
    }

This is working and tested.

这是工作和测试。

#4

A different syntax (more elegant IMO) :

不同的语法(更优雅的IMO):

var sensorNameArray = Object.keys(obj)
var sensorDataArray = Object.values(obj)

or :

var sensorDataArray = sensorNameArray.map( key => obj[key] )

#5

Best way to deal with JSON is use lodash or underscore.

处理JSON的最佳方法是使用lodash或下划线。

_.key() and _.value are functions for your requirement.

_.key()和_.value是满足您要求的函数。

Eg.:

obj = {19455746: 7476, 22489710: 473};

sensorNameArray = _.keys(obj);
sensorDataArray = _.values(obj);

If you want to proceed in your way, then you can use parenthesis as push inbuilt function of Javascript for inserting element into array.

如果你想以你的方式继续,那么你可以使用括号作为Javascript的推入内置函数,以便将元素插入到数组中。

Correct is:

for(var i in obj) {
    sensorNameArray.push(i);
    sensorDataArray.push(obj[i]);
}

#1