Question

我有一个数组，当我找到一个键的真值时，我试图迭代以获取所有索引

var f = new FileInfo(filePath);
{P:\poolman\LY21\2015\LY21_2015-03-25_03.xml}
    base: {P:\poolman\LY21\2015\LY21_2015-03-25_03.xml}
    _name: "LY21_2015-03-25_03.xml"
    Directory: {P:\poolman\LY21\2015}
    DirectoryName: "P:\\poolman\\LY21\\2015"
    Exists: false
    IsReadOnly: true
    Length: '(var f = new FileInfo(filePath);).Length' threw an exception of type 'System.IO.FileNotFoundException'
    Name: "LY21_2015-03-25_03.xml"

我只能获得第一个索引，而不是全部（我应该得到[0,2]

    sheet.headings = [
      {
        "label": "SheetId",
        "access": "R",
        "hidden": true,
        "position": "left",
        "input_type": "text"
      },
      {
        "label": "Moteur Affichage",
        "access": "W",
        "hidden": false,
        "position": "left",
        "input_type": "text",
        "value_type": "text"
      },
      {
        "label": "Navigateur",
        "access": "W",
        "hidden": true,
        "position": "left",
        "input_type": "text",
        "value_type": "text"
      }
    ]

Answer 1

也许你可以使用Array的map和filter函数来实现这一点。类似的东西：

sheet.headings.map(function(e,i){
    if (e.hidden) return i;
}).filter(function(e){
    return typeof e != 'undefined';
})

首先你得到一个索引的数组，而不是匹配hidden == true，然后你过滤删除未定义的对象。

underscore.js，遍历数组以列出特定值的所有索引

1 个答案: