第二个问题
<SCRIPT LANGUAGE="JavaScript">
<!--
function cal()
{
var valueA;
valueA = document.all.a.value;
document.all.b.value=valueA*2;
document.all.c.value+=10;
}
//-->
</SCRIPT>
<input id="a" type="text" onkeyup="cal()">
<input id="b" type="text">
<input id="c" type="text">
但是C的值现在是字符串连接，把字符串转换成数字的函数忘了，晕
<SCRIPT LANGUAGE="JavaScript">
<!--
function cal()
{
var valueA;
valueA = document.all.a.value;
document.all.b.value=valueA*2;
document.all.c.value+=10;
}
//-->
</SCRIPT>
<input id="a" type="text" onkeyup="cal()">
<input id="b" type="text">
<input id="c" type="text">
但是C的值现在是字符串连接，把字符串转换成数字的函数忘了，晕
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML>
<HEAD>
<TITLE> New Document </TITLE>
</HEAD>
<SCRIPT LANGUAGE="JavaScript">
<!--
function GetValue(){ var objselect = document.all.select;
var selectLen = objselect.length ;
var objtextarea = document.all.textarea; var i; //alert( objselect );
//alert( selectLen );
//alert( objtextarea ); if(selectLen > 0){ for(i = 0 ;i < selectLen;i++){ if(objselect.options[i].selected==true){
objtextarea.innerHTML= objtextarea.innerHTML + "\n" + objselect.options[i].value;
}
} }
}
//-->
</SCRIPT>
<BODY>
<table width="100%" height="282" border="0" cellpadding="0" cellspacing="0">
<tr>
<td width="50%" height="42" rowspan="2">
<input type="button" value="Get Value" onClick="GetValue()">
<select name="select" size="1" multiple style="width:200px;height:200px" onchange="GetValue()">
<option value="Test1">Test1</option>
<option value="Test2">Test2</option>
<option value="Test3">Test3</option>
<option value="Test4">Test4</option>
<option value="Test5">Test5</option>
<option value="Test6">Test6</option>
<option value="Test7">Test7</option>
<option value="Test8">Test8</option>
<option value="Test9">Test9</option>
<option value="Test10">Test10</option>
<option value="Test11">Test11</option>
</select>
</td>
<td width="50%" height="42" rowspan="2"><textarea name="textarea" style="width:200px;height:200px"></textarea></td>
</tr>
</table>
</BODY>
</HTML>
-------------------------------
2
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<SCRIPT LANGUAGE="JavaScript">
<!--
function cal()
{
var valueA;
valueA = document.all.a.value;
document.all.b.value=valueA*2;
document.all.c.value =parseFloat(document.all.c.value) + parseFloat(document.all.c.value);
}
//-->
</SCRIPT>
<input id="a" type="text" onkeyup="cal()">
<input id="b" type="text">
<input id="c" type="text">
----------------------------