freeCodeCamp/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/basic-javascript/manipulate-arrays-with-shift.chinese.md

id	title	challengeType	videoUrl	localeTitle
56bbb991ad1ed5201cd392cd	Manipulate Arrays With shift()	1		使用shift（）操纵数组

Description

pop()总是删除数组的最后一个元素。如果你想删除第一个怎么办？这就是.shift()用武之地。它就像.pop()一样工作，除了它删除了第一个元素而不是最后一个元素。

Instructions

使用.shift()函数从myArray删除第一项，将“shift off”值分配给removedFromMyArray 。

Tests

tests:
  - text: '<code>myArray</code>现在应该等于<code>[[&quot;dog&quot;, 3]]</code> 。'
    testString: 'assert((function(d){if(d[0][0] == "dog" && d[0][1] === 3 && d[1] == undefined){return true;}else{return false;}})(myArray), "<code>myArray</code> should now equal <code>[["dog", 3]]</code>.");'
  - text: '<code>removedFromMyArray</code>应该包含<code>[&quot;John&quot;, 23]</code> 。'
    testString: 'assert((function(d){if(d[0] == "John" && d[1] === 23 && typeof removedFromMyArray === "object"){return true;}else{return false;}})(removedFromMyArray), "<code>removedFromMyArray</code> should contain <code>["John", 23]</code>.");'

Challenge Seed

// Example
var ourArray = ["Stimpson", "J", ["cat"]];
var removedFromOurArray = ourArray.shift();
// removedFromOurArray now equals "Stimpson" and ourArray now equals ["J", ["cat"]].

// Setup
var myArray = [["John", 23], ["dog", 3]];

// Only change code below this line.
var removedFromMyArray;

After Test

console.info('after the test');

Solution

// solution required