<!doctype html><html><head><meta charset="utf-8"><title>无标题文档</title><script type="text/javascript">function yname(){ var obj=document.getElementById("Name"); var yourname=obj.value; if(yourname!=null) alert("你好!"+yourname); else alert("请输入你的姓名！");}</script></head><body><form><p>姓名：<input type="text" id="Name" ></p><input type="button" value="确定" onclick="yname()" /></form></body></html>
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