Javascript公共/私人变量

var publicVar = "I am a public variable";

function myFunction() {
  console.log(publicVar); // 输出 "I am a public variable"
}

myFunction();

function myFunction() {
  let privateVar = "I am a private variable";
  console.log(privateVar); // 输出 "I am a private variable"
}

myFunction();
console.log(privateVar); // 报错，因为 privateVar 在函数外部无法访问