xxxxxxxxxx<html><head> <meta charset="utf-8"> <title>W3Cschool教程(w3cschool.cn)</title> </head><body><p>全局变量在任何脚本和函数内均可访问。</p><p id="demo"></p><script>var carName = "Volvo";myFunction();function myFunction() { document.getElementById("demo").innerHTML = "我可以显示 " + carName;}</script></body></html>