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You may be get some help from the code below.
<%
String str="str";
%>

<script>
function accessVar(){
var varStr='<%=str%>';
alert(varStr);// here will diplay 'str'
}
</script>


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<html  onclick=”handleClick()”>
<head></head>
<body onclick=”handleClick()”>
  <div ......

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javascript(±ØÐëÊäÈë¹Ø¼ü×Ö²ÅÄܵã»÷³É¹¦)

<SCRIPT LANGUAGE="JavaScript">
<!--
function limitNum(obj) {
if(obj.value.replace(/\s/g,"")==""||obj.value.replace(/\s/g,"")=="ÊäÈë¹Ø¼ü×Ö")  {
  alert('ÇëÊäÈë¹Ø¼ü×Ö')
      return false;
}
}
//-->
</SCRIPT> 
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    <img id="randimg" src="/servlet/CreateValidateNum" width="60" height="20" />
    <span style="cursor:hand" onclick="reflush();return false; ......

javascriptÖÐreplaceÕýÔò±í´ïʽÓï·¨

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<script language="javascript">
var strM = "javascript is a good script language";
//ÔÚ´ËÎÒÏ뽫×ÖĸaÌæ»»³É×ÖĸA
alert(strM.replace("a","A"));
</script>
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