var jsonObj = {
  "创维电视" : 50,
  "卡萨帝北京" : 40,
  "家电" : 40,
  "松下" : 30,
  "格力" : 20,
  "海尔" : 20,
  "海尔商城" : 20,
  "海尔客服" : 20,
  "美的" : 20,
  "美菱" : 20
}

var value1 = eval("jsonObj." + "家电")
console.log(value1)
var value2 = jsonObj['家电'];
console.log(value2)

// 首先定义一个json对象，对象以“{”（左括号）开始，“}”（右括号）结束
// 花括号内为键、值对 键必须用引号括起来，值若不是字符串则不必
var jsonObj = {
  "创维电视" : 50,
  "卡萨帝北京" : 40,
  "家电" : 40,
  "松下" : 30,
  "格力" : 20,
  "海尔" : 20,
  "海尔商城" : 20,
  "海尔客服" : 20,
  "美的" : 20,
  "美菱" : 20
}
var keyAry =[];
var valueAry=[];


for (var key in jsonObj) {
  keyAry.push(key);
  valueAry.push(jsonObj[key]);
}
console.log(keyAry)
console.log(valueAry)

var value1 = eval("jsonObj." + "家电")
console.log(value1)
var value2 = jsonObj['家电'];
console.log(value2)