标签： !DOCTYPE htmlhtml lang=enheadmeta charset=UTF-8meta nam
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<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <meta http-equiv="X-UA-Compatible" content="ie=edge"> <meta name="author" content="杨欣"> <title>map</title> </head> <body> <script> Array.prototype.my_map = function (callback) { if (!Array.isArray(this) || !this.length || typeof callback !== 'function') { return [] } else { let result = []; for (let index = 0; index < this.length; index++) { const element = this[index]; result.push(callback(element, index, this)) } return result } } let arr = [1, 2, 3, 4, 5] let res = arr.my_map((ele, i) => { return ele + 10 }) console.log(res) </script> </body> </html>js原生要领map实现
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![[转]Node.js中package.json中^和~的区别](/uploads/allimg/200519/054J34453_lit.png "[转]Node.js中package.json中^和~的区别")