//es8
const obj = {
name: "design",
age : 19,
address : "四川省成都市金牛区金科北路"
}
console.log(Object.keys(obj))
const res = Object.keys(obj).map(key=>{
return obj[key]
})
console.log(res)
console.log(Object.values(obj))
console.log(Object.entries(obj))
for(let [key, val] of Object.entries(obj)){
console.log(`${key},${val}`)
}
const obj1 = {
name : "design",
course: "前端设计"
}
const desc = Object.getOwnPropertyDescriptors(obj1)
const desc1 = Object.getOwnPropertyDescriptor(obj, "name")
console.log(desc1)
console.log("nnnn")
console.log(desc)
// configurable: true delete可否删除
// enumerable: true 可以循环
// value: "design" 默认值
// writable: true 是否可以改 false表示不可以改
const obj2 = {}
Reflect.defineProperty(obj2, "name", {
value: "17design.cn",
writable: true,
configurable: false,
enumerable:true //默认为false
})
obj2.name = "一起设计吧"
console.log(obj2)
delete obj2.name //删除对象属性
console.log(obj2)
for (let key in obj2) {
console.log(key)
}
const str = "design"
console.log(str.padStart(9, "xa")) //xaxdesign
console.log(str.padEnd(11, "*"))
let tel = "13693467587"
let newTel = tel.slice(-4).padStart(tel.length, "*")
console.log(newTel)
一起设计吧
