几个经典的代码
只能输入汉字
<input onkeyup="value=value.replace(/[^\u4E00-\u9FA5]/g,'')" onbeforepaste="clipboardData.setData('text',clipboardData.getData('text').replace(/[^\u4E00-\u9FA5]/g,''))">
只能输入全角
<input onkeyup="value=value.replace(/[^\uFF00-\uFFFF]/g,'')" onbeforepaste="clipboardData.setData('text',clipboardData.getData('text').replace(/[^\uFF00-\uFFFF]/g,''))">
只能输入数字
<input onkeyup="value=value.replace(/[^\d]/g,'') "onbeforepaste="clipboardData.setData('text',clipboardData.getData('text').replace(/[^\d]/g,''))">
只能输入英文和数字
<input onkeyup="value=value.replace(/[\W]/g,'') "onbeforepaste="clipboardData.setData('text',clipboardData.getData('text').replace(/[^\d]/g,''))">
区分innerHTML和outerHTML
<span onclick="alert(this.innerHTML)">我用innerHTML</span>
<span onclick="alert(this.outerHTML)">我用outerHTML</span>
测试指定页面是否存在
<html>
<head>
<title>本程序用于测试指定页面是否存在</title>
<script language=javascript>
function translateHttpHeader(header) {
var meaning = "没有关于HTTP 标头：http-"+header + " 的中文信息"
switch(header) {
case 400: meaning = "请求无效" ;break;
case 401: meaning = "要求密码";break ;
case 401.1: meaning = "无权查看网页,未授权：登录失败" ;break;
case 403: meaning = "拒绝访问" ;break;
case 403.7: meaning = "要求客户证书" ;break;
case 404: meaning = "文件没找到" ;break;
case 405: meaning = "禁止访问资源";break;
case 406: meaning = "无法显示资源,无法接受";break;
case 407: meaning = "要求代理身份验证";break;
case 410: meaning = "网页不存在,永久不可用";break;
case 412: meaning = "先决条件失败" ;break;
case 414: meaning = "请求无效,URI 太长" ;break;
case 500: meaning = "内部服务器错误" ;break;
case 500.11: meaning = "网站关闭" ;break;
case 500.12: meaning = "应用程序重新启动" ;break;
case 500.13: meaning = "服务器太忙" ;break;
}
return meaning
}
function postRequest(postTo,Method) {
//尝试用XMLHTTP测试服务器。
try {
var xhttp= new ActiveXObject("Microsoft.XMLHTTP")
}
catch (e) {
longinfo.innerHTML="无法创建对象Microsoft.XMLHTTP"
}
try {
xhttp.open(Method,postTo,false,"myschool.net","myschool.net")
xhttp.send()
if (xhttp.status!=200) {
meaning = translateHttpHeader(xhttp.status);
hideFrame.document.clear();
hideFrame.document.write(xhttp.responseText)
longinfo.innerHTML="在测试服务器时<br>服务器送回以下HTTP标头!<br>"
longinfo.innerHTML+="<br><font color=red>HTTP "+xhttp.status+" "+xhttp.statusText+"</font> "
longinfo.innerHTML+="<font color=red><br>"+meaning+"</font> "
longinfo.innerHTML+="<br><br>此头表示当前请求的页面"+postTo+"可能有问题"
xhttp=null
window.status="错误"
return false;
}
else {
longinfo.innerHTML="指定的页面存在而且工作正常."
}
}
catch (e) {
longinfo.innerHTML="无法连接到指定的服务器:"+postTo+",或发生DNS错误"
longinfo.innerHTML+="<br>"+e.message+"<br><br>请确认您的网络连接。"
xhttp=null
window.status="错误"
return false;
}
window.status = "完毕"
}
function go() {
postTo = URL.value;
Method = sendMethod.value;
postTo.replace("\\","/")
if (postTo.indexOf("http://")==-1) {postTo = "http://"+postTo}
if (postTo.length >225) {longinfo.innerHTML = "URL过长，可能会造成错误。";URL.value="";return false}
window.status="正在使用"+Method+"方法测试：" + postTo +" 稍等..."
postRequest(postTo,Method)
}
</script>
</head>
<body>
请输入测试信息：<br>
URL:http://<input type=text id=URL size=100><br>
方法：<select id=sendMethod><option value="GET">GET</option><option value="POST">POST</option></select><Br>
<input type=button onclick=go() value=开始测试><hr>
<div id=longinfo>请输入需要测试的地址。</div>
<iframe id=hideFrame style="display:none"></iframe>
</body>
</html>
三位数小数点
<script language="JavaScript">
<!--
function Test(n)
{
var re=/\d{1,3}(?=(\d{3})+$)/g;
var n1=n.replace(/^(\d+)((\.\d+)?)$/,function(s,s1,s2){return s1.replace(re,"$&,")+s2;});
alert(n+"\r\n"+n1)
}
Test("1279834847944074100465236");
Test("1279834847944074100465236.3");
Test("1279834847944074100465236.333333");
//-->
</script>