如何在视图Qweb中对字段求和？Odoo 14

<span t-field="sum_field" t-esc="sum_field"/>

odoo.define('your_module_name.sum_field', function (require) {
    'use strict';

    var core = require('web.core');
    var qweb = core.qweb;
    var _t = core._t;

    // 定义求和函数
    function computeSum() {
        var sum = 0;
        $(".sum_field_class").each(function() {
            sum += parseFloat($(this).text());
        });
        return sum;
    }

    // 注册求和函数
    qweb.add_template("/your_module_name/static/src/xml/sum_field.xml", function () {
        var sum = computeSum();
        return '<span>' + sum + '</span>';
    });

});

<templates>
    <t t-name="SumField">
        <span t-field="sum_field" t-esc="sum_field"/>
    </t>
</templates>

<field name="your_field" widget="float" sum="your_module_name.sum_field"/>