TypeScript为对象动态添加属性代码示例
目录
1.定义
TypeScript 对象是包含一组键值对的实例。 值可以是标量、函数、数组、对象等,如下实例:
var object_name = { key1: "value1", // 标量 key2: "value", key3: function() { // 函数 }, key4:["content1", "content2"] //集合 } //访问对象 object_name.key1 // value1 object_name.key4 // ["content1", "content2"]
2.TypeScript 类型模板
var sites = { site1: "", site2: 0, sayHello: function () { } // 类型模板 }; sites.site1 = "site1" sites.site2 = 2 sites.sayHello = function () { console.log("hello " + sites.site1 + sites.site2); }; sites.sayHello(); // hello site1 2
3.为对象动态添加属性
如果我们使用以上的方法定义对象是无法做到为对象动态添加属性
let people = { name: "hwm", age: 18, sayHello: ()=> {} } people.sex = "man"
以上代码会报错:
3.1 解决方法
定义一个包含数组属性的接口,让对象实现该接口
interface obj { [idx: string]: any } let people: obj = {} people.name = "hwm" people.age = 18 console.log(people) // { name: 'hwm', age: 18 }
3.2 对象作为参数传递
方法一:
private ParamObj(objT: {name: string, age: number}) { let people = objT console.log(objT) } let people = {name: "hwm", age: 18} this.ParamObj(people) // {name: "hwm", age: 18}
方法二:
interface obj { [idx: string]: any } private ParamObj(objT: obj) { let people = objT console.log(objT) } let people:obj = {} people.name = "lll" people.age = 20 this.ParamObj(people) // {name: "lll", age: 20}
3.3 方法返回对象
private ReturnObj(): {name: string, age: number}{ let people = {name: "hwm", age: 18} return people } let res = this.ReturnObj() console.log(res) // {name: "hwm", age: 18}
3.4 对象数组
let tbl: {<!--{C}%3C!%2D%2D%20%2D%2D%3E-->name: string, age: number}[] = []
总结
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