我认为您必须实现一些自定义的阅读器，让我们称之为csvreader：

Ext.define('CsvReader', {
    extend: 'Ext.data.reader.Json',
    alias: 'reader.csvreader',

    getResponseData: function (response) {
        var characters = response.responseText.split('\n').reduce((akku, row) => {
            [name, email, phone] = row.split(',');
            akku.push({
                name: name,
                email: email,
                phone: phone
            });
            return akku;
        }, []);

        var json = {
            characters: characters
        };
        return json;
    }
});

Ext.application({
    name: 'Fiddle',

    launch: function () {

        //Store fetching json data
        var store = Ext.create(Ext.data.Store, {
            autoLoad: true,
            fields: ['name', 'email', 'phone'],
            proxy: {
                type: 'ajax',
                url: 'SampleData.csv',
                reader: {
                    type: 'csvreader',
                    rootProperty: 'characters'
                }
            }
        });

        Ext.create('Ext.grid.Panel', {
            title: 'Simpsons',
            store: store,
            renderTo: document.body,
            width: "100%",
            height: 300,

            columns: [{
                text: 'Name',
                dataIndex: 'name',
                editor: {
                    xtype: 'textfield',
                    allowBlank: false
                }
            }, {
                text: 'Email',
                dataIndex: 'email',
                flex: 1,
                editor: {
                    xtype: 'textfield',
                    allowBlank: false
                }
            }, {
                text: 'Phone',
                dataIndex: 'phone',
                editor: {
                    xtype: 'textfield',
                    allowBlank: false
                }
            }]
        });
    }
});

SampleData.csv文件的内容如下：

Lisa,lisa@simpsons.com,555-111-1224
Bart,bart@simpsons.com,555-222-1234
Homer,home@simpsons.com,555-222-1244
Marge,marge@simpsons.com,555-222-1254