仅在for循环的第一次迭代时更新数组

Question

The following code takes an array of objects structured like so: {html: whatever number: number value }.

function Org(data){
//array of objects
var Data=data;
for(var i=0; i<Data.length; i++){
  var nums=[];
  nums.push(Data[i].number);
console.log(nums);}
}

Nums should have be logged to the console as [1,1] on the second iteration when called with: [{html:null,number:1},{html:null,number:1}] but instead is logged as [1] on both the first and second iterations. Why might this be?

Answer 1

You need to move the initialization of num outside of the for loop. Inside it creates for each iteration a new empty array.

BTW, no need for using another variable for data .

function Org(data){
    var nums = [];
    for (var i = 0; i < data.length; i++){
        nums.push(data[i].number);
    }
    console.log(nums);
}

Answer 2

或更短：

var Org=data=>console.log(data.map(e=>e.number));