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67 lines (57 loc) · 1.16 KB
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// ## 1. 对象的定义
{
// 没有元素的空对象
let empty = {}
// 存储三个数据对的对象
let courses = {
name:'Javacript',
age:1,
isfree:true
}
}
// 定义了存储数组和对象的嵌套对象
{
let courses = {
name:'wtf',
list:['Solidity','Javascript'],
next:{
name:'React',
isfree:true
}
}
}
// ## 2.对象的读写
{
let courses = {
name:'wtf',
list:['Solidity','Javascript'],
next:{
name:'React',
isfree:true
}
}
console.log(courses['name']) // wtf 注意name是个字符串
console.log(courses.name) // wtf 这种写法没有引号
console.log(courses.list[0]) // Solidity
console.log(courses.next.name) // React 嵌套对象
}
// ## 对象的遍历
{
let obj = {
name:'Javascript',
type:'frontend',
isfree:true
}
for(let key in obj){
console.log('key '+key+': ' + obj[key])
}
}
// ## 对象的增加和修改
{
let obj = {
name:'Javascript'
}
obj.name = 'Wtf-Javascript' // name存在，就是修改
obj.type = 'frontend' // name不存在 就是创建
console.log(obj) // {name: 'Wtf-Javascript', type: 'frontend'}
}