//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"                             style="color: #808080"><em>（50字以内）</em></span>