JS - 为自定义 js 对象创建用户定义的函数

Question

The question is as simple as - is it possible to create a user-defined method for standard js objects like the val method for input ? That is, to do smth like:

function my_new_method()
{
   ...
}

...
alert($('td input').my_new_method())

Answer 1

Since that is looks like jQuery (not vanilla/standard JavaScript), you can simply use $.fn.my_new_method = // your function

You can read up on how to create a jQuery plugin here: https://learn.jquery.com/plugins/basic-plugin-creation/

Answer 2

You can use Object prototype.

 Object.prototype.my_new_method = function() { console.log(this.val()); } $("#test").my_new_method();

 <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script> <input type='text' value='abc' id="test">