javascript - 通过创建动态 key 访问json数据

Question

json 数据:

 var fruit = [{"apple":1000}, 
{"mango":100},{"orange":200}];

var user_input = "apple"; //this will change dynamically.

for(var key in fruit) {

 var val = fruit[key];
 console.log(val[user_input]);
}
output: undefined

我想使用用户输入访问数据

Answer 1

您必须遍历 fruit 数组才能找到具有该键的对象。

var fruit = [{"apple":1000},{"mango":100},{"orange":200}];
var user_input = "apple";

const obj = fruit.find((obj) => Object.keys(obj).includes(user_input));
if (obj) console.log(obj[user_input]);