How to extend javascript built-in objects

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Description

1. Through the prototype object, you can extend the customization method of the original built-in object. For example, the ability to add a custom courtship number to an array.

2. Array and string built-in objects cannot override the prototype object operation Arrray.prototype= {}, only in the way of Arrray.prototype.xxx=function () {}.

Example

/ / the application of the prototype object extends the built-in object method Array.prototype.sum = function () {var sum = 0; for (var I = 0; I < this.length; iTunes +) {sum + = this [I];} return sum;} / / Array.prototype = {/ / sum: function () {/ / var sum = 0; / / for (var I = 0; I < this.length; iTunes +) {/ / sum + = this [I]; / /} / / return sum / /} / /} var arr = [1,2,3]; console.log (arr.sum ()); console.log (Array.prototype); var arr1 = new Array (11,22,33); console.log (arr1.sum ()) After reading this, the article "how to expand javascript built-in objects" has been introduced. If you want to master the knowledge points of this article, you still need to practice and use it yourself. If you want to know more about related articles, welcome to follow the industry information channel.