Question

我正在尝试push()对象counterType的属性，但我收到以下错误：

未捕获的TypeError：无法读取属性＆＃39; push＆＃39;未定义的

我试图从JSON文件中获取特定数据并将其添加到counterType对象。我的代码如下：

    let ret = JSON.parse(this.responseText);
    let counterType: any = {};

    for (let i = 0; i < ret.topdownGranularities.TOPDOWN_SYSTEM_DATA.rows.length; i++) {
        let row = ret.topdownGranularities.TOPDOWN_SYSTEM_DATA.rows[i];
        let row_system = row.SYSTEM;
        if (row.hasOwnProperty("SYSTEM")) {
            counterType[row_system].push({ name: row_system, checked: true });
            // counterType[row_system] = "name: " + row_system + ", checked: " + true;
        }
    }

这一行有效，但每次迭代只添加一个属性，因为它只是每次重新定义counterType[row_system]的值：

// counterType[row_system] = "name: " + row_system + ", checked: " + true;

我想在每次迭代时不断向对象添加{ name: row_system, checked: true }。

Answer 1

替换

let counterType: any = {};

使用：

let counterType: any = [];

因为你将它用作数组并推入它。

此外，您不需要为推送设置索引：

counterType[row_system].push({ name: row_system, checked: true });

可以替换为

counterType.push({ name: row_system, checked: true });

Answer 2

你可以做这样的事情

public interface counterTypesModel ={
   name :any,
   checked : boolean
}
counterTypesArray : counterTypesModel = [];
counterTypesArray.push({'name': row_system,'checked' : true});

push（）属性动态的一个对象Typescript / Javascript

2 个答案: