<script>
function checklen(obj){
var lenE = obj.value.length;
var lenC = 0;
//var CJK = obj.value.match(/[u4E00-u9FA5uF900-uFA2D]/g);
//if (CJK != null) lenC += CJK.length;
tno.innerText = obj.maxlength - lenC - lenE ;
if (tno.innerText < 0) {
var tmp = 0
var cut = obj.value.substring(0, obj.maxlength);
for (var i=0; i<cut.length; i++){
tmp += /[u4E00-u9FA5uF900-uFA2D]/.test(cut.charAt(i)) ? 2 : 1;
if (tmp > obj.maxlength) break;
}
obj.value = cut.substring(0, i);
}
}
</script>
<body onload="tno.innerText = s1.maxlength;">
<textarea name="s1" rows="5" cols="50" maxlength="100" onpropertychange="checklen(this)"></textarea>
剩余<span id="tno"></span>个字符
function checklen(obj){
var lenE = obj.value.length;
var lenC = 0;
//var CJK = obj.value.match(/[u4E00-u9FA5uF900-uFA2D]/g);
//if (CJK != null) lenC += CJK.length;
tno.innerText = obj.maxlength - lenC - lenE ;
if (tno.innerText < 0) {
var tmp = 0
var cut = obj.value.substring(0, obj.maxlength);
for (var i=0; i<cut.length; i++){
tmp += /[u4E00-u9FA5uF900-uFA2D]/.test(cut.charAt(i)) ? 2 : 1;
if (tmp > obj.maxlength) break;
}
obj.value = cut.substring(0, i);
}
}
</script>
<body onload="tno.innerText = s1.maxlength;">
<textarea name="s1" rows="5" cols="50" maxlength="100" onpropertychange="checklen(this)"></textarea>
剩余<span id="tno"></span>个字符