javascript - 从 ExtJS 4 中的自定义模型类扩展

Question

如何从 extjs 中的自定义模型进行扩展。

当我在下面的示例中引用 BusinessUser 类中的字段时，是否有任何方法可以直接合并 User 和 BusinessUser 字段的字段。

Ext.define('User', {
    extend: 'Ext.data.Model',
    fields: [
        {name: 'name',  type: 'string'},
        {name: 'age',   type: 'int'},
        {name: 'phone', type: 'string'},
        {name: 'alive', type: 'boolean', defaultValue: true}
    ],
});

Ext.define('BusinessUser', {
    extend: 'User',
    fields: [
        {name: 'businessType',  type: 'string'},
        {name: 'company', type: 'string'}
    ],
});

Answer 1

您不需要手动加入字段，因为它是自动完成的。根据您的问题检查以下代码中的输出:

Ext.define('User', {
    extend: 'Ext.data.Model',
    fields: [
        {name: 'name',  type: 'string'},
        {name: 'age',   type: 'int'},
        {name: 'phone', type: 'string'},
        {name: 'alive', type: 'boolean', defaultValue: true}
    ],
});

Ext.define('BusinessUser', {
    extend: 'User',
    fields: [
        {name: 'businessType',  type: 'string'},
        {name: 'company', type: 'string'}
    ],
});

// instantiating a User object
var u = Ext.create('BusinessUser', {
    name: 'John Doe', 
    age: 30, 
    phone: '555-5555'
});

// instantiating a BusinessUser object
var bu = Ext.create('BusinessUser', {
    name: 'Jane Doe', 
    age: 40, 
    phone: '555-5556', 
    businessType: 'analyst', 
    company: 'ACME'
});

console.log(Ext.getClassName(bu)); // "BusinessUser"
console.log(Ext.getClassName(u));  // "User"
console.log(u  instanceof User); // true
console.log(bu instanceof User); // true
console.log(u  instanceof BusinessUser); // false
console.log(bu instanceof BusinessUser); // true
console.log(u  instanceof Ext.data.Model); // true
console.log(bu instanceof Ext.data.Model); // true
console.log(u  instanceof Ext.data.Store); // false, just to check if it's not returning true for anything
console.log(bu instanceof Ext.data.Store); // false
console.log("name"    in u.data);  // true
console.log("name"    in bu.data); // true
console.log("company" in u.data);  // false
console.log("company" in bu.data); // true