Question

任何人都可以帮我解决如何在json中获取特定对象的问题吗？

我只想总结stringify输出中的所有3个。

＆＃13;

var arr_question = [{"$1z_1":3,"$2o_1":"Question 1."},{"$1z_1":3,"$2o_1":"Question2."},{"$1z_1":3,"$2o_1":"Question3."}];

console.log("output: "+arr_question.$1z_1);
console.log("arrays: "+arr_question)

＆＃13;

Answer 1

你有一个对象数组。您需要遍历数组，访问属性并添加它们。一种选择是使用reduce方法：

＆＃13;

var arr_question = [{"$1z_1":3,"$2o_1":"Question 1."},{"$1z_1":3,"$2o_1":"Question2."},{"$1z_1":3,"$2o_1":"Question3."}];

console.log(
  "output: " +
  arr_question.reduce((sum, obj) => sum + obj.$1z_1, 0)
);

＆＃13;

Answer 2

您可以使用forEach迭代数组，并将数组中每个对象的值添加到先前声明的“total”变量中，该变量是所有值的总和。

var arr_question = [{"$1z_1":3,"$2o_1":"Question 1."},{"$1z_1":3,"$2o_1":"Question2."},{"$1z_1":3,"$2o_1":"Question3."}];

var total = 0;
arr_question.forEach(function(obj){
  total += obj.$1z_1;
 })

console.log("output: " + total); // gives "output: 9"

如何在json stringify输出中获取特定对象？

2 个答案: