怎样将负数转为正数：如：-6→6怎样将div中的字变为红色，用

bigo 2002-08-06 01:46:45

怎样将负数转为正数：如：-6→6怎样将div中的字变为红色，用javascript语句控制。
怎样在一边输入时不断变化，即启动CheckLength函数。
而现在onchange不行呀？
<script language="javascript">
function CheckLength(limitedLength,txtName,divID){
var inputLength=document.forms[0][txtName].value.length;
var length=limitedLength-inputLength;
0Aif(length<0)
document.all[divID].innerText3D"最多可输入："+limitedLength+".已输入："+inputLength+".超出了："+length+".";
else
document.all[divID].innerText3D"最多可输入："+limitedLength+".已输入："+inputLength+".还可输入："+length+".";
}

</script>
<META NAME="GENERATOR" Content="Microsoft Visual Studio 7.0">
</HEAD>
<BODY>
<form name="frmPost">
<input type="text" name="txtSubject" onchange='CheckLength(10,"txtSubject","divInputHits")'>
<input type="button" name="btn" onclick='CheckLength(10,"txtSubject","divInputHits")'>
</form>
<DIV id="divInputHits">
f
</DIV>
多谢！

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alexxing 2002-08-07

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负数变正数： x = -x 或 x = 0-x

qiushuiwuhen 2002-08-06

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1.Math.abs()
2.innerHTML or style
<div id=demo></div>
<script>demo.innerHTML="answer=<font color=red>"+Math.abs(-6)+"</font>"</script>

3.onpropertychange
4.match(/[^\x00-\xff]/g)

<script language="javascript">
function CheckLength(limitedLength,txtName,divID){
var inputLength=document.forms[0][txtName].value.length;
try{inputLength+=document.forms[0][txtName].value.match(/[^\x00-\xff]/g).length}catch(e){}
var length=limitedLength-inputLength;
if(length<0)
document.all[divID].innerText="最多可输入："+limitedLength+".已输入："+inputLength+".超出了："+length+".";
else
document.all[divID].innerText="最多可输入："+limitedLength+".已输入："+inputLength+".还可输入："+length+".";
}

</script>
<META NAME="GENERATOR" Content="Microsoft Visual Studio 7.0">
</HEAD>
<BODY>
<form name="frmPost">
<input type="text" name="txtSubject" onpropertychange='CheckLength(10,"txtSubject","divInputHits")'>
<input type="button" name="btn" onclick='CheckLength(10,"txtSubject","divInputHits")'>
</form>
<DIV id="divInputHits">
f
</DIV>