主页
JavaScript
JavaScript Let 关键词
tryjs_scope_local
运行 ❯
×
更改方向
保存代码
更改主题
<!DOCTYPE html> <html> <body> <h2>JavaScript 作用域</h2> <p>在 myFunction() 之外，carName 未定义。</p> <p id="demo1"></p> <p id="demo2"></p> <script> myFunction(); function myFunction() { var carName = "Volvo"; document.getElementById("demo1").innerHTML = typeof carName + " " + carName; } document.getElementById("demo2").innerHTML = typeof carName; </script> </body> </html>