<html>?
<head runat="server">?
??? <title></title>?
??? <script type="text/javascript">?
??
??????? var maxstrlen = 160;?
??????? function Q(s) { return document.getElementById(s); }?
??
??????? function checkWord(c) {?
??????????? len = maxstrlen;?
??????????? var str = c.value;?
??????????? myLen = getStrleng(str);?
??????????? var wck = Q("wordCheck");?
??
??????????? if (myLen > len * 2) {?
??????????????? c.value = str.substring(0, i + 1);?
??????????? }?
??????????? else {?
??????????????? wck.innerHTML = Math.floor((len * 2 - myLen) / 2);?
??????????? }?
??????? }?
??
??????? function getStrleng(str) {?
??????????? myLen = 0;?
??????????? i = 0;?
??????????? for (; (i < str.length) && (myLen <= maxstrlen * 2); i++) {?
??????????????? if (str.charCodeAt(i) > 0 && str.charCodeAt(i) < 128)?
??????????????????? myLen++;?
??????????????? else?
??????????????????? myLen += 2;?
??????????? }?
??????????? return myLen;?
??????? }?
?????
??? </script>?
</head>?
<body>?
??? <form id="form1" runat="server">?
??? <div style="font-size: 16px">?
??????? 控制輸入框字符輸入，計算輸入字符總數,顯示剩余字數;<br>?
??????? 一個英文字符算一個字符，一個中文字符算兩個字符計算。?
??? </div>?
??? <div>?
??????? <textarea onkeyup="javascript:checkWord(this);" onmousedown="javascript:checkWord(this);"?
??????????? name="content" style="overflow-y: scroll"></textarea>?
??? </div>?
??? <div>?
??????? 還可以輸入<span style="font-family: Georgia; font-size: 26px;" id="wordCheck">160</span>個字符?
??? </div>?
??? </form>?
</body>?
</html>
