做网页求代码，点一下，多出一个输入框，或者屏幕中间弹出一个输入框 关于js中prompt（）弹出框，能不能再同一个弹出框中创建...
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#div1{position:absolute; left:200; top:100; width:350; border :1px solid AAAAAA; background:F5F5F5; box-shadow:4px 4px 6px AAAAAA}#div1>button{font-size:1.5em; width:50%; height:40; background:transparent}#div1>button,#div1>div>div{margin:0; border:solid 0 AAAAAA}function dbsubmit(){errorMessage=[]; tmp=userForm.elements; for(i=0;i0){alert("\u8bf7\u8f93\u5165"+errorMessage.join("\u3001"))}else{alert("\u63d0\u4ea4\u8868\u5355\u6210\u529f\uff01"); userForm.submit()}}\u767b\u5f55\u3000\u8bc4\u8bba\u8bf7\u8f93\u5165\u4f60\u7684\u8bc4\u8bba\uff1a\u3000\u53d6\u6d88\u3000\u7559\u4e0b\u8bc4\u8bba\u4f1a\u5458\u767b\u5f55✕\u6ce8\u518c\u5e10\u53f7\uff1a\u6ce8\u518c\u5bc6\u7801\uff1a\u53d6\u6d88\u63d0\u4ea4
\u5355\u7eaf\u7528promote\uff08\uff09\u4e0d\u80fd\uff0c\u56e0\u4e3aprompt(text,defaultText)\u63a5\u53d7\u4e24\u4e2a\u53c2\u6570\u3002
text \u53ef\u9009\u3002\u8981\u5728\u5bf9\u8bdd\u6846\u4e2d\u663e\u793a\u7684\u7eaf\u6587\u672c\uff08\u800c\u4e0d\u662f HTML \u683c\u5f0f\u7684\u6587\u672c\uff09\u3002
defaultText \u53ef\u9009\u3002\u9ed8\u8ba4\u7684\u8f93\u5165\u6587\u672c\u3002
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<html>
<head>
<script type="text/javascript">
function disp_prompt()
{
var name=prompt("请输入您的名字","Bill Gates")
if (name!=null && name!="")
{
document.write("你好！" + name + " 今天过得怎么样？")
}
}
</script>
</head>
<body>
<input type="button" onclick="disp_prompt()" value="显示提示框" />
</body>
</html>
实现百度的那个还有点复杂 网上有代码你可以找找
具体思路就是那个登陆框也是个DIV ， 点击后 会弹出来并定位在屏幕中央 ，然后用CSS 设置样式和布局，，需要用到滤镜 貌似
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