在處理當使用者輸入多少字同時顯示剩餘輸入字數時，在ie11下實現，然測試提出在ie9下原本實現的方法無法實現，故去查詢方法，發現onpropertychange在ie9下無法觸發，故將觸發條件增加即可，
1.增加onpaste當用戶貼上時觸發，
2.onfocus當用戶取消焦點時觸發，
3.onkeyup當用戶鍵盤按鍵鬆開時觸發，
程式碼如下：
<textarea name="content" id="suggestionContent"
**onpaste="return onCharsChange(this);"
onpropertychange="return onCharsChange(this);"
onfocus="return onCharsChange(this);"
onkeyup="return onCharsChange(this);"**
cols="45" rows="5"
class="textarea easyui-validatebox"></textarea>

js程式碼如下：

var cap_max = 100;//可傳送的字數
        function onCharsChange(varField) {
            var suggestionContent = document.getElementById("suggestionContent");
            var charsmonitor1 = document.getElementById("charsmonitor1");
            var charsmonitor2 = document.getElementById("charsmonitor2"
 
);
            var leftChars = getLeftChars(varField);
            if (leftChars >= 0) {
                //charsmonitor1.value=cap_max-leftChars;
                //charsmonitor2.value=leftChars;
                charsmonitor1.innerHTML = cap_max - leftChars;
                charsmonitor2.innerHTML = leftChars;
                return
 
 true;
            } else {
                charsmonitor1.value = cap_max;
                charsmonitor2.value = "0";
                //window.alerts("訊息內容超過字數限制。");
                var len = suggestionContent.value.length + leftChars;
                suggestionContent.value = suggestionContent.value.substring(0, len);
                leftChars = getLeftChars(suggestionContent);
                if (leftChars >= 0) {
                    charsmonitor1.innerHTML = cap_max - leftChars;
                    charsmonitor2.innerHTML = leftChars;
                }
                return false;
            }
        }

        function getLeftChars(varField) {
            var cap = cap_max;
            var leftchars = cap - varField.value.length;
            return (leftchars);
        }