How to make a function to go after an element

 

This question already has an answer here:

  • How does JavaScript .prototype work? 21 answers

    • 你可以使用原型来实现它

    // `getElementById` returns a `Element` object so extend it's prototype
Element.prototype.someFunction = function(){
   // this.somethig
}

document.getElementById("element").someFunction();


    Element.prototype.someFunction = function() {
  console.log(this.value)
}

document.getElementById("element").someFunction();
    <input value="abc" id="element" />

    You are looking for prototypes

    https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/prototype 

    element.prototype.someFunction = function(){
  this.doSomething(); // this refers to element
}
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