sc0002的博客

Object.keys() 获取对象自身所有属性let obj = {‘a’: ‘123’,‘b’: ‘456’}console.log(Object.keys(obj)) //[“a”,“b”]

flattern: Web展平；数据中心网络扁平化；打平const columns = [{id:1, posts:[{id:'1_1'}]},{id:2, posts: [{id:'2_1'},{{id:'1_1'}}]}]

const id = !!route.query.id 转换成 Boolean 判断id是否存在

markdown-it是一个用来解析markdown的库，它能够将markdown代码编译为html代码。https://markdown-it.docschina.org/#%E7%94%A8%E6%B3%95%E7%A4%BA%E4%BE%8B

Date.now() - Math.floor(Math.random() * 2000)

e.target 返回触发事件对象，this返回绑定事件对象<ul> <li>123</li> <li>abc</li> <li>00</li></ul>var ul = document.querySelector('ul')ul.addEventListener('click', function(){ //点击 li // 给ul绑定事件 this指向 ul console.log(

var obj = {name: 'abc',age: 18}; if('name' in obj){ console.log('yes');} else { console.log('none');} //输出“true”

它以HTMLElement为参数，且返回布尔值。<div id="parent"> <div id="children"></div></div>var parent = $('parent');var children = $('children')；console.log(parent.contains(children)) //trueconsole.log(children.contains(parent)) /

const nameFruits = ['a', 'b', 'c']; if (nameFruits.includes('a')) { // 执行代码 }

let a = [].push(); console.log(a) // 0 let a = [1,2,3].push(); console.log(a) // 3 let a = [1,2,3].push(4); console.log(a) // 4