Get the current custom attribute value

Suppose there is a tag h5, we add a custom attribute value to it (which is added from dynamically)

Click the h5 tag to get the current corresponding custom attribute value?

I wrote this first as I took it for granted:

<h5 class="left t-title" @click='getDataId' :data-id=""></h5>

<script>
  methods: {
    getDataId() {
      (-id);
    }
   },
  
</script>

Obviously, this won't get the value of data-id. . . .

This should be done:

<h5 class="left t-title" @click='getDataId()' :data-id=""></h5>

<script>
  methods: {
    getDataId(id) {
      (id);
    }
   },
  
</script>

The above is all the content of this article. I hope it will be helpful to everyone's study and I hope everyone will support me more.