Vue drop-down selection

I would like to ask how this drop-down selection shows that the default value is the taskBodyName corresponding to the taskBodyId passed in the background (this code can achieve what I want to know)
project is written separately from the front and back ends. The second section of code obtains the valid data of all taskBody tables. I write the back end. Today, when I look at the code at the front end, I don"t understand how this default value comes out.
the front end is written in vue

<div class="form-group">
        <label for="taskBodyId"></label>
        <div>
            <select id="taskBodyId"/>
        </div>
    </div>

                {
                        id: "taskBodyId",
                        type: 1,
                        validate: {required: true},
                        dataSource: {url: window.homePath + "Admin/Task/TaskBody/findAll"}
                    },

Vuex

Aug.11,2021

Code display is incomplete. In fact, you can solve the problem by asking your front-end teammates.

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