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 是字符串var y = new String("John"); // y 是一个对象document.getElementById("demo").innerHTML = x===y;</script><p>=== 为绝对相等，即数据类型与值都必须相等。</p> </body></html>