如何制作一个功能去追逐元素

这个问题在这里已经有了答案：

JavaScript .prototype如何工作？ 21个答案

---

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" />

---

您正在寻找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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