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07-12作业
︷肉園耔︷
Original
480 people have browsed it

  • 代码区
    — 作用域和闭包
    ```

    <script>
    let staff={
    id:1,

    1.   name:"朱老师",
    2.   age:20,
    3.   setAge(age){
    4.       if(age >=18 && age <60 ){
    5.           return (this.age=age);
    6.       }
    7.       console.log("年龄:(18-60)之间");
    8.   }, };

    console.log(‘age=’,staff.age);
    console.log(‘name’,staff.name);
    staff.setAge(65);

let staff={
data:{id:1,name:”朱老师”,age:20,},
setAge(age){if(age>=18 && age <60){
return (this.data.age=age);
}
console.log(“年龄:(18-60)之间”);
},
};
console.log(staff.data.age);
staff.setAge(40);
console.log(staff.data.age);

访问属性
1.读属性

2.写属性

let staff={
data:{id:1,name:”朱老师”,age:20},
//读取的”访问起属性”
get age(){
console.log(“aaa”);
return this.data.age;
},
set age(age){if(age >=18 && age<60){
return(this.data.age=age);
}
console.log(“年龄:(19-60)之间”);
}
};
console.log(staff.age);
staff.age=81;
console.log(“age=”,staff.age);

块作用域

if(true){
var a =10;
let a=15;
console.log(“a”,a);
}
console.log(“a=”,a);

function demo1(a){
let b=20;
console.log(“a=%d,b=%d”, a , b);
}
demo1(10);
console.log(15,31);

function parent(){
let m =500;
return function (a){
let b=2;
console.log(a,b,m);
};
}
let f =parent();
console.log(f);
f(4);

console.log(parent());
parent(4);
push推动 从尾部添加字母
let arr=[];
console.log(arr.push(“a”));
console.log(arr);
console.log(arr.push(“b”,”c”,”d”));
console.log(arr);

  1.    pop(无参数)  从尾部删除
  2.    console.log(arr.pop());
  3.    console.log (arr);
  5.    unshift从头部添加
  6.    console.log(arr.unshift(1,2,3));
  7.    console.log(arr);   
  9.    console.log (arr.shift());
  10.    console.log(arr);
  12.     arr=["html" ,"css","js"];
  13.     let res=arr.join();
  14.     console.log(arr);
  15.     res=arr.join("---");
  16.     console.log(res);
  18.   les= arr.join("</li><li>");
  19.     console.log(les);
  20.   console.log('<ul><li>$<res></ul></li>');
  21.   //document.body.insertAdiacentHTML("beforeend",html);
  22.   //cancat():
  23.   console.log("hello".concat("php.cn"));
  24.   console.log(["hello"].concat(["php.cn"]));
  26.    //splice()实现数组的增删改查的操作
  27.    arr=[1,2,3,4,5];
  28.    res =arr.splice(3,1);
  29.    console.log(res);
  31.    //res=arr.splice(2,0,"html","css");
  32.    res=arr.splice(3,0, ...["php","js"]);
  34.    console.log(res);
  35.    console.log(arr);
  37.    //更新操作，即删除又新增
  38.    res=arr.splice(2,1,"javascript");
  39.    console.log(res);
  40.    console.log(arr);
  41.    //forEach() 对数组中的每一个成员使用一个回调方法进行处理
  42. const items = document.querySelectorAll("li");
  43.   items.forEach(function(item){
  44.      item.style.color="red";
  45.    })
  46.    document.querySelectorAll("li").forEach(xxx=>(xxx.style.color="red"));

//filter()对数组中的每个使用回调方法进行处理，只返回数据为true的元素
arr=[1,2,3,4,5,6,7,8];
res=arr.filter(a=>!(a%2));
console.log(res);

reduce();归并操作，将数组中的所有元素指定的回调处理一个单一结果返回
arr=[1,2,3,4,5];
res=arr.reduce(function(prev,curr){
console.log(prev,curr);
return prev+curr;
});

  1. res=arr.reduce((prve,curr)=>prve+curr);
  2. console.log(res);

arr=[5,6,7,8,9,12,13,14,15];
res=arr.reduce(function(prev,curr){
console.log(prev,curr);
return prev+curr;
});
res=arr.reduce((prve,curr)=>prve+curr);
console.log(res);

  1. user={
  2. 1:1,
  3. 2:"name",
  4. 3:"admin@php.cn",
  5. length:3,

}
for(let item of Array.from(user)){
console.log(item);
}
/* let staff={
id:1,
name:”朱老师”,
age:20,
setAge(age){
if(age >=18 && age <60 ){
return (this.age=age);
}
console.log(“年龄:(18-60)之间”);
},
};
console.log(‘age=’,staff.age);
console.log(‘name’,staff.name);
staff.setAge(65);

let staff={
data:{id:1,name:”朱老师”,age:20,},
setAge(age){if(age>=18 && age <60){
return (this.data.age=age);
}
console.log(“年龄:(18-60)之间”);
},
};
console.log(staff.data.age);
staff.setAge(40);
console.log(staff.data.age);

访问属性
1.读属性
2.写属性

let staff={
data:{id:1,name:”朱老师”,age:20},
//读取的”访问起属性”
get age(){
//console.log(“aaa”);
return this.data.age;
},
set age(age){if(age >=18 && age<60){
return(this.data.age=age);
}
console.log(“年龄:(19-60)之间”);
}
};
console.log(staff.age);
staff.age=81;
console.log(“age=”,staff.age);

块作用域

if(true){
var a =10;
let a=15;
console.log(“a”,a);
}
console.log(“a=”,a);

function demo1(a){
let b=20;
console.log(“a=%d,b=%d”, a , b);
}
demo1(10);
console.log(15,31);

function parent(){
let m =500;
return function (a){
let b=2;
console.log(a,b,m);
};
}/
/let f =parent();
console.log(f);
f(4);
const items= document.querySelectorAll(‘.list .item’);
console.log(items);
Array.from(items).forEach(item => (item.style.color=”red”));

console.log(items[0]);
items[0].style.background=”yellow”;
//返回满足条件的元素集合第一个，常用来返回唯一元素
const first = document.querySelector(“.list .item “);
console.log(first);
console.log(first===items[0]);
const ul = document.querySelectorAll(“.list”);
console.log(ul);

const ul=document.querySelector(“.list”);
console.log(ul);
body
const body = document.querySelector(“body”);
body.style.backgroundColor=”lightcyan”;

console.log(document.head);

let $ =function(selector){
return document.querySelector(selector);
}
console.log($(“ul”));

let $ =selector=>document.querySelector(selector);
let $ =selector=>document.querySelector(selector);
console.log($(“body”).style.backgroundColor=”lightcyan”);

  1. 表单获取的特殊性

const form= document.querySelector(“#IN”);

console.log(form);
document.forms获取表单ID选择器和nama
console.log(document.forms.IN);
console.log(document.forms.FM);
console.log(document.forms.IN === document.forms.FM);
console.log(document.forms.IN.login.value);
//DOM树中的所有内容成为节点
//节点类型：元素，文本，文档
let ul=document.querySelector(‘.list’);
console.log(ul.childNodes);

  1. //children
  2.  //Array.from(ul.children).forEach(item=>(item.style.color="red"));
  3.  //[...ul.children].forEach(item=>(item.style.color="red"));
  4.  //console.log(([...ul.children].shift().style.color="blue"));
  5.  console.log((ul.firstElementChild.style.color="blue"));
  6.  console.log(ul.lastElementChild.style.color="blue");
  7.  //第二个元素
  8.  console.log(ul.firstElementChild.nextElementSibling.style.color="red");
  10.  //第四个元素
  11.  console.log(ul.lastElementChild.previousElementSibling.style.color="blue");
  12.  //第三个元素
  13.  const li =document.querySelector(".item:nth-of-type(3)");
  14.  console.log(li);

//创建只在内存中，不在页面中 creeateElement
let div=document.createElement(“div”);
let p =document.createElement(‘p’);
p.textContent=”Hello World”;
//将元素渲染到页面中
document.body.append(p);
console.log(document.querySelector(‘div’).id);
console.log(document.querySelector(‘div’).data-email);
对于这样的自定义属性，成为数据属性
console.log(document.querySelector(“div”)[“data-email”]);
//dataset专用获取’data-前缀的自定义’
let email2=document.querySelector(“div”).dataset.email;
let email1=document.querySelector(“div”).dataset.email;
console.log(email2);
console.log(email1);
</script>

```

Correcting teacher：PHPzPHPz

Correction status：unqualified

Teacher's comments：还是markdown语法的问题，如果不知道怎么使用，可以找助教
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