一获取对象数组的值:(绑定键值对)
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
</head>
<body>
<script>
const arr = [{label:'男',value: 1}, {label:'女',value: 0}]
// const arr1=(.
function f(arr) {
// 写代码,得到
let obj1 = arr.map((item) => {
return Object.assign({}, { value: item.value, label: item.label})
})
}
let obj = f(arr);
console.log(obj)
// obj = {'1': '男', '0': '女'}
</script>
</body>
</html>
二: 获取数组对象中某一属性的值
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
</head>
<body>
<script>
var arr = [{label:'男',value: 1}, {label:'女',value: 0}]
function f(arr) {
// 写代码,得到
const obj=[]
arr.forEach(item => {
obj.push(item.label)
})
return obj
}
var arr2 = f(arr);
console.log(arr2)
// arr2 = ['男', '女']
</script>
</body>
</html>
三条件操作数组对象
// 如果A的pid == B的id
// A是B的下属
// 如果A的pid == B的pid
// A和B是同事
var data = [
{id:"01", name: "张大大", pid:"", job: "项目经理"},
{id:"02", name: "小亮", pid:"01", job: "产品leader"},
{id:"03", name: "小美", pid:"01", job: "UIleader"},
{id:"04", name: "老马", pid:"01", job: "技术leader"},
{id:"05", name: "老王", pid:"01", job: "测试leader"},
{id:"06", name: "老李", pid:"01", job: "运维leader"},
{id:"07", name: "小丽", pid:"02", job: "产品经理"},
{id:"08", name: "大光", pid:"02", job: "产品经理"},
{id:"09", name: "小高", pid:"03", job: "UI设计师"},
{id:"10", name: "小刘", pid:"04", job: "前端工程师"},
{id:"11", name: "小华", pid:"04", job: "后端工程师"},
{id:"12", name: "小李", pid:"04", job: "后端工程师"},
{id:"13", name: "小赵", pid:"05", job: "测试工程师"},
{id:"14", name: "小强", pid:"05", job: "测试工程师"},
{id:"15", name: "小涛", pid:"06", job: "运维工程师"}
]
// 问题1. 找出 与 小刘 处于统一领导下的同事
function f(data, name){
// 完成代码
//找到小刘的下标 index
const index = data.findIndex(item => item.name === name)
// 找到与小刘pid相同的pid
const newArr = data.filter(item => {
return item.pid === data[index].pid
})
return newArr
}
const arr1 = f(data, '小刘')
console.log(arr1) //
// [{id:"10", name: "小刘", pid:"04", job: "前端工程师"},
// {id:"11", name: "小华", pid:"04", job: "后端工程师"},
// {id:"12", name: "小李", pid:"04", job: "后端工程师"}]
// 问题2. 找出 小亮 的所有下属
function f2(data, name){
// 完成代码
//找到小亮的下标 index
const index = data.findIndex(item => item.name === name)
const newArr = data.filter(item => {
//通过小亮的下标 找到他的id 和与之对应的pid
return item.pid === data[index].id
})
return newArr
}
const arr3 = f2(data, '小亮')
console.log(arr3) //
// [{id:"07", name: "小丽", pid:"02", job: "产品经理"},
// {id:"08", name: "大光", pid:"02", job: "产品经理"}]
四将对象的属性值添加到新数组中
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
</head>
<body>
<script>
var obj = {label:'男',value: 1,age: 18}
function f(obj) {
// 写代码,得到
return Object.values(obj)
}
var arr = f(obj);
console.log(arr)
// arr = ['男', '1', '18'] // 所有的属性值取出来,保存在数组中
</script>
</body>
</html>
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