复制代码 代码如下:

//文本框剩余字数提示(字符大小）

function textLimitCheckSj(thisArea, maxLength, SpanId) {

var str = thisArea.value;

if (getChrLen(str, maxLength) > maxLength * 2) {

thisArea.value = str.substring(0, x-1);

}

else {

var varss = '(剩余字数:' + Math.floor((maxLength * 2 - getChrLen(str, maxLength)) / 2) + ')';

document.getElementById(SpanId).innerHTML = varss;

}

}

function getChrLen(str, maxLength) {

var realLength = 0, len = str.length, charCode = -1;

x = 0;

for (; (x < len) && (realLength <=maxLength * 2); x++) {

charCode = str.charCodeAt(x);

if (charCode >= 0 && charCode <= 128)

realLength += 1;

else

realLength += 2;

}

return realLength;

}

?

<asp:TextBox ID="txtOwner_Name" runat="server" Width="200px" BackColor="LightYellow"

onkeyup="textLimitCheckSj(this,50,'spOwner_Name')"></asp:TextBox><span id="spOwner_Name"

><em>（50字以内）</em></span>