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test.html
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test.html
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<!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>
<style>
div {
background: red;
width: 200px;
height: 200px;
}
/* #div{
float: left;
background: green;
} */
#parent {
width: 500px;
height: 500px;
background: blue;
position: relative;
display: flex;
justify-content: center;
align-items: center;
}
/* #children{
position: absolute;
top: 50%;
left: 50%;
transform: translate(-50%, -50%);
} */
/* #children{
position: absolute;
top: 0;
left: 0;
right: 0;
bottom: 0;
margin: auto;
} */
.flex-box {
display: flex;
/* flex-flow: column wrap; */
justify-content: center;
align-items: stretch;
width: 500px;
height: 500px;
background: #000;
}
#flexbox{
width: 100px;
height: 100px;
background: green;
display: flex;
justify-content: space-between;
}
#flexbox div{
width: 20px;
height: 20px;
background: red;
}
#flexbox div:nth-child(2){
align-self: flex-end;
}
.dailog {
width: 200px;
height: 200px;
margin: 200px;
overflow: hidden;
}
.text {
margin: 0;
overflow: hidden;
text-overflow: ellipsis;
line-height: 22px;
}
.text::after{
content: '确认';
}
.confrim {
display: inline;
width: 30px;
height: 10px;
background: blue;
color: white;
}
</style>
</head>
<body>
<p id="p">123123</p>
<div id="parent">
<div id="children"></div>
</div>
<section class="flex-box">
<div></div>
<div></div>
</section>
<div id="box"></div>
<div id="flexbox">
<div></div>
<div></div>
</div>
<div class="dailog">
<p class="text">
封疆大吏发卡机as登陆开发机爱丽丝快点解封拉设计费老的手机安抚辣椒水弗兰克驾驶的开发傻了的开发机死啦的恐惧
封疆大吏发卡机as登陆开发机爱丽丝快点解封拉设计费老的手机安抚辣椒水弗兰克驾驶的开发傻了的开发机死啦的恐惧
封疆大吏发卡机as登陆开发机爱丽丝快点解封拉设计费老的手机安抚辣椒水弗兰克驾驶的开发傻了的开发机死啦的恐惧
封疆大吏发卡机as登陆开发机爱丽丝快点解封拉设计费老的手机安抚辣椒水弗兰克驾驶的开发傻了的开发机死啦的恐惧
</p>
<span class="confrim">确定</span>
</div>
<script>
function myCall(context, ...args) {
const self = context || window;
self.fn = this;
const result = self.fn(...args);
delete self.fn;
return result;
}
function myBind(context, ...bindArgs) {
// 保存当前函数，因为bind需要返回一个新的函数，在新的函数里this指向会有问题
const self = this;
// 不使用原生的call方法，使用自己写的 myCall 方法
return function (...args) {
Function.prototype.myCall = myCall;
console.log([...bindArgs], [...args]);
return self.myCall(context, ...bindArgs, ...args);
};
}
Function.prototype.myBind = myBind;
let obj = {
name: 'jack',
age: 18,
};
function getAge(desc, desc1, desc2) {
console.log(desc, desc1, desc2);
return this.age;
}
let myGetAge = getAge.myBind(obj, 'myBind调用', '参数1');
console.log(getAge('正常调用', '参数1', '参数2'));
// 正常调用 参数1 参数2
// undefined
console.log(myGetAge('参数2'));
// myBind调用 参数1 参数2
// 18
function deepClone(obj) {
if (obj === null) return obj;
if (obj instanceof Date) return new Date(obj);
if (obj instanceof RegExp) return new RegExp(obj);
if (typeof obj !== 'object') return obj;
let result = Array.isArray(obj) ? [] : {};
for (let key in obj) {
if (obj.hasOwnProperty(key)) {
result[key] = deepClone(obj[key]);
}
}
return result;
}
function Person(name, age) {
this.name = name;
this.age = age;
}
Person.prototype.field = 'ps';
const person = new Person('jack', 18);
// console.log(person); // {name: 'jack', age: 18}
// console.log(person.field); // ps
// // 通过构造函数创建出来的实例对象会有一个 __proto__ 属性，指向构造函数的原型对象 peototype
// // 如果自身没有这个属性则会通过原型链往上层找
// console.log(person.__proto__ === Person.prototype);
// // 构造函数的 prototype.constructor 指向 构造函数本身
// console.log(Person.prototype.constructor === Person);
// console.log(Person.__proto__ === Function.prototype);
// // 构造函数原型对象上的 __proto__ 指向 Object 的原型对象，构造函数本身也是一个对象
// console.log(Person.prototype.__proto__ === Object.prototype);
// // 对象原型上的 __proto__ 属性指向 null，原型链的顶层就是 null
// console.log(Object.prototype.__proto__ === null);
// console.log(person.__proto__.__proto__ === Object.prototype);
function promiseAll(promises) {
return new Promise((resolve, reject) => {
let length = promises.length;
let result = [];
let count = 0;
for (let i = 0; i < length; i++) {
Promise.resolve(promises[i])
.then((res) => {
result[i] = res;
count += 1;
if (count === length) {
resolve(result);
}
})
.catch((err) => {
reject(err);
});
}
});
}
const p1 = new Promise((resolve, reject) => {
setTimeout(() => {
resolve(11111);
}, 3000);
});
const p2 = new Promise((resolve, reject) => {
setTimeout(() => {
resolve(22222);
}, 1000);
});
// promiseAll([p1, 123, p2])
// .then((res) => {
// console.log('then', res);
// })
// .catch((err) => {
// console.log('catch', err);
// });
// let arr = [1,2,3]
// for(let i = 0; i<arr.length; i++) {
// console.log(i)
// }
const tree = {
children: [
{
index: 0,
children: [
{
index: 1,
children: [
{
index: 3,
},
],
},
],
},
{
index: 4,
},
{
index: 5,
children: [
{
index: 7,
children: [
{
index: 8,
},
],
},
],
},
{
index: 6,
},
],
};
function dfs(node, nodeList = []) {
if (!node) return;
console.log(node.index);
nodeList.push(node);
let children = node.children || [];
children.forEach((item) => {
dfs(item, nodeList);
});
return nodeList
}
console.log(dfs(tree, []))
function dfs2(node) {
let nodes = [];
let stack = [];
if(node) {
stack.push(node);
while(stack.length) {
let cur = stack.pop();
nodes.push(cur);
let children = cur.children || [];
// 因为上面是 pop，所以这里得从最后面开始遍历 push 进去
// unshift 性能不好
for(let i = children.length - 1; i >= 0; i--) {
stack.push(children[i]);
}
}
}
return nodes;
}
console.log(dfs2(tree))
// for(var i = 0; i< 10; i++) {
// const a = document.createElement('a');
// a.innerHTML = i + '<br />'
// a.setAttribute('number', i);
// document.getElementById('box').appendChild(a);
// }
// document.getElementById('box').addEventListener('click', (e) => {
// const data = e.target
// console.log(e.target.getAttribute('number'))
// })
for(var i = 0; i< 10; i++) {
const a = document.createElement('a');
a.innerHTML = i + '<br />'
a.addEventListener('click', () => {
alert(i)
})
document.getElementById('box').appendChild(a);
}
</script>
</body>
</html>