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// 变量提升

console.log(a); var a = 1; function a () { // 1 } a = 2; function a () { // 2 } a();

// 事件循环

new Promise((resolve) => { log(3) resolve(); }).then(() => log(4)) async function foo () { console.log(‘5’); await bar(); console.log(‘7’); } async function bar () { console.log(‘6’); }

foo();

// this

var name =“window”;

var bar ={name: “bar” };

var foo = {

name: “foo”,

say:() => {log(this.name)},

say2: function () {

return () => {log(this.name)}

}

}

foo.say()

foo.say.call(bar);

foo.say2()();

foo.say2.call(bar)();

foo.say2().call(bar);

// “田”字布局

浮动、绝对定位、flex

// 跨域

cors、jsonp、反向代理

// Vue

Vue-router

// 2SUM

两数求和

var arr = [2,3,5,6,6];

var target = 8

// rem