var strIn = "我爱jsp", strOut = "*";
for (var i = 0; i < strIn.length; i++){
strOut = strOut + strIn.charAt(i) + "*";
}
alert(strOut);
for (var i = 0; i < strIn.length; i++){
strOut = strOut + strIn.charAt(i) + "*";
}
alert(strOut);
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>form</title>
<script type="text/javascript">
var str = "我爱jsp";
var array1 = str.split('');
//alert(array1);
var str1 = '*';
for(var i=0;i<array1.length;i++)
{
str1+=array1[i]+'*';
}
alert(str1);
</script>
</head><body>
</body>
</html>
<SCRIPT LANGUAGE="JavaScript">
<!--
(function test(){
var str = "我爱JSP";
alert("*"+str.split("").join("*"))
})()
//-->
</SCRIPT>
var strOut = "*" + strIn.join("*") + "*";
alert(strOut);
<!--
(function test(){
var str = "我爱JSP";
alert(str.replace(/(s*)/g,"*"))
})()
//-->
</SCRIPT>
<head><title>插入字符(可能需要 IE 支持)</title></head>
<body>
<script language="JScript">
function InsertChar(){
var strIn, strOut = "*";
strIn = document.getElementById("txtIn").value;
for (var i = 0; i < strIn.length; i++){
strOut = strOut + strIn.charAt(i) + "*";
}
document.getElementById("txtOut").value = strOut;
}
</script>
<input type=text id="txtIn" value="我爱jsp" size=40>
<input type=button value="插入字符" onClick="InsertChar();">
<input type=text id="txtOut" size=80>
</body>
</html>