How to find the length of a JSON object

This question already has an answer here:

Length of a JavaScript object 32 answers

---

遍历数组并获取对象属性名称。

var legend = [{
  "min": 0,
  "max": 'first_color',
  "color": "#1a9850"
}, {
  "min": 'first_color',
  "max": 'sec_color',
  "color": "#fee08b"
}, {
  "min": 'sec_color',
  "max": 'thrd_color',
  "color": "#ff3300"
}, {
  "min": 'thrd_color',
  "max": 'frth_color',
  "color": "#d73027",
  "Abc": "gsfg"
}];

var res = legend.map(function(v) {
  console.log(Object.keys(v).length);
  return Object.keys(v).length;
});

console.log(res);

---

'JSON' object is the wrong terminology.

Referring to 'Length of a JavaScript object', the best solution would be:

Object.keys(obj).length

But a better solution would be to prototype Object

Object.size = function(obj) {
   return Object.keys(obj).length;
}

---

你可以使用Object.keys

 console.log(Object.keys(legend[0]).length)// 3

 console.log(Object.keys(legend[3]).length);//4

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