function notifyTextLength() {

var inputNum = document.getElementById("txtTitle").value.replace(/[^\x00-\xff]/g, "**").length; //得到輸入的字節數

if (inputNum <= 200) {

matchWords = document.getElementById("txtTitle").value.length;

document.getElementById("inputedWord").innerHTML = inputNum + "字節," + matchWords + "字符";

document.getElementById("inputtingWord").innerHTML = (200 - inputNum) + "字母,"+(Math.round(((200-inputNum)/2)-0.5))+"漢字";

}

if (inputNum > 200) {

document.getElementById("txtTitle").value = document.getElementById("txtTitle").value.substring(0, matchWords);

//如果超過200字節，就截取到200字節

}

}

<input id="txtTitle" type="text" class="inputText" runat="server" onpropertychange="notifyTextLength();" />

當前已經輸入<span id="inputedWord" style="color:red"></span> 還可以輸入<span id="inputtingWord" style="color:Red;"></span>

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