freeCodeCamp/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/basic-javascript/accessing-nested-arrays.chinese.md

id, title, challengeType, videoUrl, localeTitle

id	title	challengeType	videoUrl	localeTitle
56533eb9ac21ba0edf2244cd	Accessing Nested Arrays	1		访问嵌套数组

Description

正如我们在前面的示例中所看到的，对象可以包含嵌套对象和嵌套数组。与访问嵌套对象类似，可以链接数组括号表示法来访问嵌套数组。以下是如何访问嵌套数组的示例：

var ourPets = [
{
animalType：“猫”，
名称：[
“Meowzer”
“蓬松”，
“洁猫”
]
}，
{
动物类型：“狗”，
名称：[
“点”，
“库巴”
“羊羊”
]
}
]。
ourPets [0] .names [1]; //“蓬松”
ourPets [1] .names [0]; //“Spot”

Instructions

使用对象点和数组括号表示法从变量myPlants检索第二个树。

Tests

tests:
  - text: <code>secondTree</code>应该等于“松树”
    testString: assert(secondTree === "pine");
  - text: 使用点和括号表示法访问<code>myPlants</code>
    testString: assert(/=\s*myPlants\[1\].list\[1\]/.test(code));

Challenge Seed

// Setup
var myPlants = [
  {
    type: "flowers",
    list: [
      "rose",
      "tulip",
      "dandelion"
    ]
  },
  {
    type: "trees",
    list: [
      "fir",
      "pine",
      "birch"
    ]
  }
];

// Only change code below this line

var secondTree = ""; // Change this line

After Test

console.info('after the test');

Solution

// solution required