<!DOCTYPE html><html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>RunJS 演示代码</title><script>var ck = function(){var x = prompt ("输入昵称: ", "Tom");/*第一个变量为提示语，第二个变量为默认初始值*/alert(x);}</script></head><body><button onclick="ck();">click</button></body></html>
