We read every piece of feedback, and take your input very seriously.
To see all available qualifiers, see our documentation.
Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.
By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.
Already on GitHub? Sign in to your account
几乎所有的编程语言都原生支持数组类型,因为数组是最简单的内存数据结构。 数组通常情况下用于存储一系列同一种数据类型的值。 但在 JavaScript 里,数组中可以保存不同类型的值。但我们还是要遵守最佳实践,别这么做(大多数语言都没这个能力)。
new Array()
const daysOfWeek = new Array( "Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday" );
[]
const daysOfWeek = [ "Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday", ];
array.push(item)
array.unshift(item)
array.splice(index, 0, item)
splice() 第二个参数为 0 时,表示插入数据。
let myArray = [1, 2, 3]; // 在 索引 0 的位置,插入 A myArray.splice(0, 0, "A"); console.log(myArray); //--> ['A', 1, 2, 3]
array.pop(item)
array.shift(item)
array.splice(start, number)
let myArray2 = [1, 2, 3, 4, 5]; // 删除索引 4 位置起,2 个元素 myArray2.splice(4, 2); console.log(myArray2); //--> [1, 2, 3, 4]
array.splice(index, 1, item)
let myArray3 = [1, 2, 3, 4, 5, 6]; // 修改 索引 1 的位置的元素为 AA myArray2.splice(1, 1, "AA"); console.log(myArray3); //--> [1, "AA", 3, 4, 5, 6]
array.splice(index, number, item)
let myArray4 = [1, 2, 3, 4, 5, 6, 7]; // 在 索引 2 的位置起,修改两个元素为 AA BB myArray2.splice(2, 2, "AA", "BB"); console.log(myArray3); //--> [1, 2, "AA", "BB", 5, 6, 7]
The text was updated successfully, but these errors were encountered:
No branches or pull requests
JavaScript 数据结构与算法(二)数组
几乎所有的编程语言都原生支持数组类型,因为数组是最简单的内存数据结构。
数组通常情况下用于存储一系列同一种数据类型的值。
但在 JavaScript 里,数组中可以保存不同类型的值。但我们还是要遵守最佳实践,别这么做(大多数语言都没这个能力)。
创建和初始化数组
new Array()
[]
数组常见操作
添加元素
array.push(item)
array.unshift(item)
array.splice(index, 0, item)
删除元素
array.pop(item)
array.shift(item)
array.splice(start, number)
例如:
修改元素
array.splice(index, 1, item)
array.splice(index, number, item)
The text was updated successfully, but these errors were encountered: