console 命令行工具 X clear

console

function Fn(){
    let n = 10
    this.n = 1
    this.sum = function(){
        console.log(++this.n)
        console.log(++n)
    }
}
let fn = new Fn()
fn.sum()
fn.sum()
let fn1 = new Fn()
fn1.sum()
fn1.sum()

console.log('闭包项目理解'')