我是面向对象javascript的新手,正在尝试定义一个具有数组作为数据成员的类。该类的数据成员将另一个类的对象存储为数组。
此示例将更清楚
function classA(id, objB_01)
{
this.id = id; // data member that store a simple value
this.arrayname = objB_01 // How multiple instance of classB is stored in this array
}
function classB( id, name, status)
{
this.id = id;
this.name = name;
this.status = status
}
objB_01 = new classB("01", "john", "single");
objB_02 = new classB("02", "smith" "single");
objB_03 = new classB("03", "nina", "married");
现在我的问题是我如何写classA
以便classA
的单个实例保存一个数组,该数组存储classB
的多个对象
这样的东西
objA = new classA("01",objB_01);
objA.arrayname = objB_02;
objA.arrayname = objB_03;
现在最后,objA
包含一个字符串和一个数组,用于存储classB的多个对象
请指出正确的方向
一个选项可以是在构造函数中初始化一个空数组,也可以使用一些方法将对象添加到该数组中。
function classA (id) {
this.id = id;
this.array = [];
this.add = function (newObject) {
this.array.push(newObject);
};
}
然后您可以执行此操作:
objA = new classA("01");
objA.add(objB_01);
objA.add(objB_02);
objA.add(objB_03);
深入研究JavaScript Arrays周围的规格文档可能会有所帮助。
除此之外,要回答有关拥有一个classA的问题,其中单个实例具有多个classB实例的数组-我相信您正在寻找数组方法.push()
同样,您可能希望利用标准的JavaScript重载构造函数模式来增强类定义。
这样的东西
function classA(id, objarray)
{
this.id = id; // data member that store a simple value
this.arrayname = objarray || []; //if objarray isn't passed it'll initiate an empty array
}
function classB( id, name, status)
{
this.id = id;
this.name = name;
this.status = status
}
objB_01 = new classB("01", "john", "single");
objB_02 = new classB("02", "smith" "single");
objB_03 = new classB("03", "nina", "married");
var objBarray = [objB_01, objB_02, objB_03];
//now you can use construct & initiate classA in two different ways
//Push each object individually
var objA = new classA("01");
objA.arrayname.push(objB_01);
objA.arrayname.push(objB_02);
objA.arrayname.push(objB_03);
//or push the entire list at once
var objA = new classA("01", objBarray);
尝试
var data = {};
var classData = function (id, name, status, options) {
if (options) {
this.id = options.id;
this[options.arrayname] = [];
};
if (!this.hasOwnProperty("id")) {
throw new Error("No id set on `classData` array."
+ "Please set `id` for `classData` at `options` object")
};
var j = (id && name && status) ? JSON.stringify({
id: id,
name: name,
status: status
}) : false;
j ? this[Object.keys(this).filter(function (v) {
return v !== "id"
})[0]].push(JSON.parse(j)) : null;
return this
}.bind(data);
// set `id` at `data` ,
// add first item to `data.arrayname`
classData("01", "abc", "single", {"id":"01", "arrayname":"files"});
// set data at `data`
classData("02", "def", "married");
classData("02", "ghi", "single");
// read `classData`
console.log(classData());
var data = {};
var classData = function (id, name, status, options) {
if (options) {
this.id = options.id;
this[options.arrayname] = [];
};
if (!this.hasOwnProperty("id")) {
throw new Error("No id set on `classData` array."
+ "Please set `id` for `classData` at `options` object")
};
var j = (id && name && status) ? JSON.stringify({
id: id,
name: name,
status: status
}) : false;
j ? this[Object.keys(this).filter(function (v) {
return v !== "id"
})[0]].push(JSON.parse(j)) : null;
return this
}.bind(data);
// set `id` at `data` ,
// add first item to `data.arrayname`
classData("01", "abc", "single", {"id":"01", "arrayname":"files"});
// set data at `data`
classData("02", "def", "married");
classData("02", "ghi", "single");
// read `classData`
console.log(classData());