baoshi-was/resources/views/customer/project/part/_system.blade.php

<div class="row">
    <label for="usage_fee" class="col-2 text-info">系统使用费</label>
    <input id="usage_fee" type="number" step="0.01" min="0" :class="errors.usage_fee ? 'is-invalid' : ''" class="col-6 form-control" v-model="model.system.usage_fee">
    <span class="invalid-feedback mt-0 offset-2" role="alert" v-if="errors.usage_fee">
        <strong>@{{ errors.usage_fee[0] }}</strong>
    </span>
</div>
<div class="row mt-3">
    <label for="tax_rate_id" class="col-2 text-muted">税率</label>
    <select id="tax_rate_id" class="col-3 form-control" v-model="model.system.tax_rate_id">
        <option> </option>
        <option v-for="tax in pool.taxRates" :value="tax.id">@{{ tax.value }}%</option>
    </select>
</div>