本文共 500 字，大约阅读时间需要 1 分钟。

const mul = (num1, num2) => num1 * num2;const demo = () => console.log('demo')const power = num1 => num1 * num1; console.log(mul(10, 20))demo()console.log(power(10))setTimeout(() => {    console.log(this)    console.log('this')}, 1000)const obj = {    abc() {        setTimeout(function () {            console.log(this)            console.log('11111')        })    },    bc() {        setTimeout(() => {            console.log(this)            console.log('22222')        })    }}obj.abc();obj.bc();

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