xxxxxxxxxx<html><head><meta charset="utf-8"><title>W3Cschool教程(w3cschool.cn)</title></head><body><p>点击按钮查看输入的对话框。</p><button onclick="myFunction()">点我</button><p id="demo"></p><script>function myFunction(){ var x; var person=prompt("请输入你的名字","Harry Potter"); if (person!=null && person!=""){ x="你好 " + person + "！今天感觉如何？"; document.getElementById("demo").innerHTML=x; }}</script></body></html>