JavaScript compatible text input length prompt for Firefox_Form special effects

<div id="msg"></div> <textarea maxlength="10" id="txt">
[Ctrl A select all Note: If you need to introduce external Js, you need to refresh to execute

]<script> function checkLen() {var obj=inputTxt var maxLen=parseInt(obj.getAttribute('maxlength')) //最大限制输入的字符数量 var len=obj.value.replace(/[^\x00-\xff]/g,'oo').length; var llen=maxLen-len; if(len>maxLen) { var i=0; for(var z=0;z<len;z++) { if(obj.value.charCodeAt(z)>255) { i=i+2; }else { i=i+1; } if(i>=maxLen) { obj.value=obj.value.slice(0,(z + 1)); break; } } } if(llen<0)llen=0 if(len<maxLen)len=maxLen document.getElementById('msg').innerHTML='已输入字符数量：'+len+' 剩余数量:'+llen } var inputTxt=document.getElementById('txt'); if(!/msie/i.test(navigator.userAgent)) inputTxt.addEventListener("input",checkLen,false); else {inputTxt.onpropertychange=checkLen} </script>