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javascript代码大全(二)

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17.屏蔽功能键Shift,Alt,Ctrl 

<!--<br /> <br /> Code highlighting produced by Actipro CodeHighlighter (freeware)<br /> http://www.CodeHighlighter.com/<br /> <br /> --><script> 
function look(){  
if(event.shiftKey)  
alert(
"禁止按Shift键!"//可以换成ALT CTRL 
}  
document.onkeydown
=look;  
</script>


18. 网页不会被缓存 

<!--<br /> <br /> Code highlighting produced by Actipro CodeHighlighter (freeware)<br /> http://www.CodeHighlighter.com/<br /> <br /> --><META HTTP-EQUIV="pragma" CONTENT="no-cache"> 
<META HTTP-EQUIV="Cache-Control" CONTENT="no-cache, must-revalidate"> 
<META HTTP-EQUIV="expires" CONTENT="Wed, 26 Feb 1997 08:21:57 GMT"> 
或者
<META HTTP-EQUIV="expires" CONTENT="0">


19.怎样让表单没有凹凸感? 
 

<!--<br /> <br /> Code highlighting produced by Actipro CodeHighlighter (freeware)<br /> http://www.CodeHighlighter.com/<br /> <br /> --><input type=text style="border:1 solid #000000">

或 

<!--<br /> <br /> Code highlighting produced by Actipro CodeHighlighter (freeware)<br /> http://www.CodeHighlighter.com/<br /> <br /> --><input type=text style="border-left:none; border-right:none; border-top:none; border-bottom:  
1 solid #000000"
></textarea>


20.
<div><span>&<layer>的区别?  
<div>(division)用来定义大段的页面元素,会产生转行  
<span>用来定义同一行内的元素,跟<div>的唯一区别是不产生转行  
<layer>是ns的标记,ie不支持,相当于<div> 
21.让弹出窗口总是在最上面: 

<!--<br /> <br /> Code highlighting produced by Actipro CodeHighlighter (freeware)<br /> http://www.CodeHighlighter.com/<br /> <br /> --><body onblur="this.focus();">


22.不要滚动条?  
让竖条没有:  
 

<!--<br /> <br /> Code highlighting produced by Actipro CodeHighlighter (freeware)<br /> http://www.CodeHighlighter.com/<br /> <br /> --><body style=`overflow:-Scroll;overflow-y:hidden`>  
</body>

让横条没有:  

<!--<br /> <br /> Code highlighting produced by Actipro CodeHighlighter (freeware)<br /> http://www.CodeHighlighter.com/<br /> <br /> --><body style=`overflow:-Scroll;overflow-x:hidden`>  
</body> 


两个都去掉?更简单了  
 

<!--<br /> <br /> Code highlighting produced by Actipro CodeHighlighter (freeware)<br /> http://www.CodeHighlighter.com/<br /> <br /> --><body scroll="no">  
</body>

23.怎样去掉图片链接点击后,图片周围的虚线? 

<!--<br /> <br /> Code highlighting produced by Actipro CodeHighlighter (freeware)<br /> http://www.CodeHighlighter.com/<br /> <br /> --><href="#" onFocus="this.blur()"><img src="logo.jpg" border=0></a>


24.电子邮件处理提交表单 

<!--<br /> <br /> Code highlighting produced by Actipro CodeHighlighter (freeware)<br /> http://www.CodeHighlighter.com/<br /> <br /> --><form name="form1" method="post" action="mailto***@***.com" enctype="text/plain">  
<input type=submit> 
</form>


25.在打开的子窗口刷新父窗口的代码里如何写? 

<!--<br /> <br /> Code highlighting produced by Actipro CodeHighlighter (freeware)<br /> http://www.CodeHighlighter.com/<br /> <br /> -->window.opener.location.reload()


26.如何设定打开页面的大小 

<!--<br /> <br /> Code highlighting produced by Actipro CodeHighlighter (freeware)<br /> http://www.CodeHighlighter.com/<br /> <br /> --><body onload="top.resizeTo(300,200);">


打开页面的位置

<!--<br /> <br /> Code highlighting produced by Actipro CodeHighlighter (freeware)<br /> http://www.CodeHighlighter.com/<br /> <br /> --><body onload="top.moveBy(300,200);">


27.在页面中如何加入不是满铺的背景图片,拉动页面时背景图不动  

<!--<br /> <br /> Code highlighting produced by Actipro CodeHighlighter (freeware)<br /> http://www.CodeHighlighter.com/<br /> <br /> --><style>  
body  
{background-image:url(logo.gif); background-repeat:no-repeat;  
background-position
:center;background-attachment: fixed}  
</style> 


28. 检查一段字符串是否全由数字组成 

<!--<br /> <br /> Code highlighting produced by Actipro CodeHighlighter (freeware)<br /> http://www.CodeHighlighter.com/<br /> <br /> --><script language="javascript"><!-- 
function checkNum(str){return str.match(//D/)==null} 
alert(checkNum("1232142141" 
alert(checkNum(
"123214214a1" 
// --></script>


29. 获得一个窗口的大小 

<!--<br /> <br /> Code highlighting produced by Actipro CodeHighlighter (freeware)<br /> http://www.CodeHighlighter.com/<br /> <br /> -->document.body.clientWidth;
document.body.clientHeight


30. 怎么判断是否是字符 

<!--<br /> <br /> Code highlighting produced by Actipro CodeHighlighter (freeware)<br /> http://www.CodeHighlighter.com/<br /> <br /> -->if (/[^/x00-/xff]/g.test(s)) alert("含有汉字"; 
else alert("全是字符";


31.TEXTAREA自适应文字行数的多少 

<!--<br /> <br /> Code highlighting produced by Actipro CodeHighlighter (freeware)<br /> http://www.CodeHighlighter.com/<br /> <br /> --><textarea rows=1 name=s1 cols=27 onpropertychange="this.style.posHeight=this.scrollHeight"> 
</textarea>


32. 日期减去天数等于第二个日期 

<!--<br /> <br /> Code highlighting produced by Actipro CodeHighlighter (freeware)<br /> http://www.CodeHighlighter.com/<br /> <br /> --><script language=javascript> 
function cc(dd,dadd) 

//可以加上错误处理 
var a = new Date(dd) 
= a.valueOf() 
= a - dadd * 24 * 60 * 60 * 1000 
= new Date(A) 
alert(a.getFullYear() 
+ "" + (a.getMonth() + 1+ "" + a.getDate() + "" 

cc(
"12/23/2002",2
</script>


33. 选择了哪一个Radio 

<!--<br /> <br /> Code highlighting produced by Actipro CodeHighlighter (freeware)<br /> http://www.CodeHighlighter.com/<br /> <br /> --><HTML><script language="vbscript"> 
function checkme() 
for each ob in radio1 
if ob.checked then window.alert ob.value 
next 
end function 
</script><BODY> 
<INPUT name="radio1" type="radio" value="style" checked>style 
<INPUT name="radio1" type="radio" value="barcode">Barcode 
<INPUT type="button" value="check" onclick="checkme()"> 
</BODY></HTML>


34.脚本永不出错 

<!--<br /> <br /> Code highlighting produced by Actipro CodeHighlighter (freeware)<br /> http://www.CodeHighlighter.com/<br /> <br /> --><SCRIPT LANGUAGE="javascript">  
<!-- Hide  
function killErrors() {  
return true;  
}  
window.onerror 
= killErrors;  
// -->  
</SCRIPT>


35.ENTER键可以让光标移到下一个输入框 

<!--<br /> <br /> Code highlighting produced by Actipro CodeHighlighter (freeware)<br /> http://www.CodeHighlighter.com/<br /> <br /> --><input onkeydown="if(event.keyCode==13)event.keyCode=9">


36. 检测某个网站的链接速度: 
把如下代码加入
<body>区域中: 

<!--<br /> <br /> Code highlighting produced by Actipro CodeHighlighter (freeware)<br /> http://www.CodeHighlighter.com/<br /> <br /> --><script language=javascript> 
tim
=1 
setInterval(
"tim++",100
b
=1 
var autourl=new Array() 
autourl[
1]="http://www.njcatv.net/"
autourl[
2]="javacool.3322.net" 
autourl[
3]="http://www.sina.com.cn/"
autourl[
4]="http://www.nuaa.edu.cn/"
autourl[
5]="http://www.cctv.com/"
function butt(){ 
document.write(
"<form name=autof>" 
for(var i=1;i<autourl.length;i++
document.write(
"<input type=text name=txt"+i+" size=10 value=测试中……> =》<input type=text  
name=url
"+i+" size=40> =》<input type=button value=GO  
onclick=window.open(this.form.url
"+i+".value)><br>" 
document.write(
"<input type=submit value=刷新></form>" 

butt() 
function auto(url){ 
document.forms[
0]["url"+b].value=url 
if(tim>200
{document.forms[
0]["txt"+b].value="链接超时"
else 
{document.forms[
0]["txt"+b].value="时间"+tim/10+""
b
++ 

function run(){for(var i=1;i<autourl.length;i++)document.write("<img  
src=http://
"+autourl+"/"+Math.random()+" width=1 height=1  
onerror=auto(http://
";+autourl+"`)>"
run()
</script>
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