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//Textarea maxlength
//flag:text¿òÃû×Ö£¬num:ÏÞÖÆµÄ×Ö½ÚÊý
function maxLen(flag,num){
if(document.getElementById('lastMessage').value=="0" || document.getElementById('lastMessage').value==flag){
var i=document.getElementById(flag).value.replace(/[\u0800-\uffff]/g,"\u0061\u0061\u0061").length; //byte length
if(i>num){
switch(flag){
case ("textareaName"): document.getElementById('lastMessage').value="textareaName"; break;
default: break;
}
document.getElementById('message').value="³¬³ö·¶Î§("+ i+"/"+num+"λ)";
window.setTimeout( function(){ document.getElementById(flag).focus();document.getElementById(flag).select(); }, 0);
}else {
document.getElementById('message').value="";
document.getElementById('lastMessage').value="0";
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