在 JSON 对象中查找值？

Question

trying to check if the data is not empty

https://jsfiddle.net/1foj0y6t/

any idea?

var j = {
    "data": "solution",
  "sum":"100",
  "value":"500"
};

var obj2 = $(j).find("data").html();
console.log(obj2);

Answer 1

You can just ask if j.data isn't false :

 var j = { "data": "solution", "sum":"100", "value":"500" }; if (j.data) { console.log(j.data); } else { console.log('no data!'); }

...or you can use it like a array index (bracket notation):

 var j = { "data": "solution", "sum":"100", "value":"500" }; if (j['data']) { console.log(j['data']); } else { console.log('no data!'); }

or shorthand version:

 var j = { "data": "solution", "sum":"100", "value":"500" }; console.log(j.data||'no data!');

or by declaration :

 var j = { "data": "solution", "sum":"100", "value":"500" }; let {data} = j; console.log(data||'no data!');

Answer 2

You can do something like that to check if data exists or not

 var j = { "data": "solution", "sum": "100", "value": "500" }; const { data } = j const x = data || "empty" console.log(x)