javascript - 如何添加成功功能？

Question

我想添加一个成功和失败的功能，但我该怎么做呢？我在下面有这段代码：

    class ={};

    class.hey = function(values)
    {
      document.getElementById(values.id).innerHTML = values.Val ;

    return class;
    }



    class.hey({
    id:"target",
    Val: "hello world",//this wil work and will display that value in the span tag
    })

<span id="target"></span>//here will appear the value passed before

我如何添加一个函数来告诉我一切是否正常？我一直在尝试，但我无法解决这个 id 是如何工作的示例

    class ={};

    class.hey = function(values)
    {
      document.getElementById(values.id).innerHTML = values.Val ;

    return class;
    }



    class.hey({
    id:"objetive",//the element does not exist
    Val: "hello world",//this wil work and will display that value in the span tag
    success:function(msg)
        {
 alert("ok!")

},

     error:function(msg){
      alert("wrong");
   }
    })

<span id="target"></span>//here will appear the value passed before

Answer 1

这对 JavaScript 来说根本不是自动的，但你可以这样做：

class.hey = function (value) {
    var value = document.getElementById(values.id);
    if (!value) {
        value.error(values.id + " is not an element")
        return false;
    }
    value.innerHTML = values.val;
    value.success("okay!");
}