编辑代码

function A(){
    console.log(name)
    // console.log(age)
    var name="11"
    let age = 21
}

A();


function testB1(){
    // console.log(value)
    console.log(typeof value)
    // let value = "red"
}

testB1()

// console.log(value)
// console.log(typeof value)
// function testB2(){
//     let value = "red"
// }

// testB2()