How to realize Class Array Transformation by JavaScript
This article will explain in detail how to achieve class array conversion in JavaScript. The editor thinks it is very practical, so I share it for you as a reference. I hope you can get something after reading this article.
Class array conversion
1. The ultimate piece
Array.prototype.slice.call (arguments) / / arguments is a class array (pseudo array) Array.prototype.slice.apply (arguments) Array.from (arguments) [... arguments]
Class array: a method that represents a length attribute but not an array
Call,apply: change the this in slice to point to arguments, so arguments can also call array methods
Array.from creates an array of similar or iterable objects as an array
... Is to extend the class array to a string and then define it as an array
two。 The beginning
Array.prototype.slice = function (start,end) {var result = new Array (); start = start | | 0; end = end | | this.length; / / this points to the called object. When call is used, you can change the direction of the this, that is, point to the incoming object. This is the key for (var I = start; I < end; iTunes +) {result.push (var [I]);} return result } this is the end of the article on "how to convert JavaScript into class arrays". I hope the above content can be of some help to you, so that you can learn more knowledge. if you think the article is good, please share it for more people to see.
