如何在 JavaScript 代码中获取数据属性的值？

我有下一个html：

<span data-typeId="123" data-type="topic" data-points="-1" data-important="true" id="the-span"></span>

是否可以获取以data-，并将其用在JavaScript代码类似于下面的代码？现在我得到null结果。

document.getElementById("the-span").addEventListener("click", function(){
    var json = JSON.stringify({
        id: parseInt(this.typeId),
        subject: this.datatype,
        points: parseInt(this.points),
        user: "H. Pauwelyn"
    });
});

您需要访问dataset财产 https://developer.mozilla.org/en-US/docs/Web/API/HTMLElement/dataset:

document.getElementById("the-span").addEventListener("click", function() {
  var json = JSON.stringify({
    id: parseInt(this.dataset.typeid),
    subject: this.dataset.type,
    points: parseInt(this.dataset.points),
    user: "Luïs"
  });
});

Result:

// json would equal:
{ "id": 123, "subject": "topic", "points": -1, "user": "Luïs" }