How to implement bind function by js
This article mainly shows you "js how to achieve bind function", the content is easy to understand, clear, hope to help you solve your doubts, the following let Xiaobian lead you to study and learn "js how to achieve bind function" this article.
The implementation steps of the bind function:
1. To determine whether the calling object is a function, even if we are defined on the prototype of the function, it may be called using call and so on.
two。 Save a reference to the current function and get the rest of the incoming parameter values.
3. Create a function to return
4. Apply is used inside the function to bind function calls. You need to determine whether the function is used as a constructor. In this case, you need to pass the this of the current function to the apply call, and in other cases, pass in the specified context object.
/ / bind function implementation Function.prototype.myBind = function (context) {/ / determine whether the calling object is the function if (typeof this! = = "function") {throw new TypeError ("Error");} / / get the parameter var args = [. Arguments] .slice (1), fn = this; return function Fn () {/ / pass in different binding values return fn.apply (this instanceof Fn? This: context, args.concat (. Arguments);};}; that's all of the article "how js implements bind functions". Thank you for reading! I believe we all have a certain understanding, hope to share the content to help you, if you want to learn more knowledge, welcome to follow the industry information channel!
