xxxxxxxxxx<html><head> <meta charset="utf-8"> <title>W3Cschool教程(w3cschool.cn)</title> </head><body><p>在 HTML 中, 所有全局变量都会成为 window 变量。</p><p id="demo"></p><script>myFunction();document.getElementById("demo").innerHTML = "我可以显示 " + window.carName;function myFunction() { carName = "Volvo";}</script></body></html>