xxxxxxxxxx<html><head> <meta charset="utf-8"> <title>W3Cschool教程(w3cschool.cn)</title> </head><body> <p id="demo"></p><script>var x = "John"; // x是一个字符串var y = new String("John"); // y是一个对象document.getElementById("demo").innerHTML =typeof x + " " + typeof y;</script></body></html>