空数组不为空

Question

我有一个看起来像这样的函数：

public returnData(): { points: Array<{ x: number, y: number }>, pointsCount: Array<number> } {
    return {
        points: [{x: 0, y: 1},{x: 1, y: 2 }],
        pointsCount: [1, 2, 3, 4]
    }
 }

如果我会写这样的话：

let mydata = this.returnData();

对象包含两个数组：{points:Array(2), pointsCount:Array(4)}

但是，如果我要改变它：

public returnData(): { points: Array<{ x: number, y: number }>, pointsCount: Array<number> } {

     let localdata: Array<{x:number, y:number}> = [];
     let local_points_count: Array<number> = [];

     localdata.push([{x:0,y:1},{x:1,y:2}]);
     local_points_count.push([1,2,3,4]);

    return {
        points: localdata,
        pointsCount: local_points_count
    }
 }
let mydata = this.returnData();

将返回 {points:Array(0),pointsCount:Array(0)}。如果我在 Chrome 控制台中检查数据，它不是空的。

请帮帮我！

Answer 1

您正在将一个数组推入一个数组。试试这个

localdata.push({x:0,y:1},{x:1,y:2});
local_points_count.push(1,2,3,4);