JavaScriptÑéÖ¤´óÈ«

jsÑéÖ¤±íµ¥´óÈ«
1. ³¤¶ÈÏÞÖÆ
<script>
function test()
{
if(document.a.b.value.length>50)
{
alert("²»Äܳ¬¹ý50¸ö×Ö·û£¡");
document.a.b.focus();
return false;
}
}
</script>
<form name=a onsubmit="return test()">
<textarea name="b" cols="40" wrap="VIRTUAL" rows="6"></textarea>
<input type="submit" name="Submit" value="check">
</form>
2. Ö»ÄÜÊǺº×Ö
<input onkeyup="value="/oblog/value.replace(/[^\u4E00-\u9FA5]/g,'')">
3." Ö»ÄÜÊÇÓ¢ÎÄ
<script language=javascript>
function onlyEng()
{
if(!(event.keyCode>=65&&event.keyCode<=90))
event.returnvalue=false;
}
</script>
<input onkeydown="onlyEng();">
4. Ö»ÄÜÊÇÊý×Ö
<script language=javascript>
function onlyNum()
{
if(!((event.keyCode>=48&&event.keyCode<=57)||(event.keyCode>=96&&event.keyCode<=105)))
//¿¼ÂÇС¼üÅÌÉϵÄÊý×Ö¼ü
event.returnvalue=false;
}
</script>
<input onkeydown="onlyNum();">
5. Ö»ÄÜÊÇÓ¢ÎÄ×Ö·ûºÍÊý×Ö
<input onkeyup="value="/oblog/value.replace(/[\W]/g,"'') "onbeforepaste="clipboardData.setData('text',clipboardData.getData('text').replace(/[^\d]/g,''))">
6. ÑéÖ¤ÓÍÏä¸ñʽ
<SCRIPT LANGUAGE=javascript RUNAT=Server>
function isEmail(strEmail) {
if (strEmail.search(/^\w+((-\w+)|(\.\w+))*\@[A-Za-z0-9]+((\.|-)[A-Za-z0-9]+)*\.[A-Za-z0-9]+$/) != -1)
return true;
else
alert("oh");
}
</SCRIPT>
<input type=text onblur=isEmail(this.value)>
7. ÆÁ±Î¹Ø¼ü×Ö(ÕâÀïÆÁ±Î***ºÍ****)
<script language="javascript1.2">
function test() {
if((a.b.value.indexOf ("***") == 0)||(a.b.value.indexOf ("****") == 0)){
alert(":)");
a.b.focus();
return false;}
}
</script>
<form name=a onsubmit="return test()">
<input type=text name=b>
<input type="submit" name="Submit" value="check">
</form>
8. Á½´ÎÊäÈëÃÜÂëÊÇ·ñÏàͬ
<FORM METHOD=POST ACTION="">
<input type="password" id="input1">
<input type="pa