<li class="item pin">
<span class="overlabel" style="display: block;">請輸入驗證碼</span>
<input type="text" class="txt" id="checkNum" name="checkNum" maxlength="4" onkeydown="keyboardEvent(event);" />
<img src="${basePath}/randomImageCodeStyle" width="60" height="28" id="chkNum" 　 title="單擊重新加載驗證碼" style="cursor: hand" />
</li>

//監聽Enter鍵自動提交事件
function keyboardEvent(event){
var keyCode=event.keyCode ? event.keyCode:event.which?event.which:event.charCode;//解決瀏覽器之間的差異問題
if(keyCode==13){
submitForm();
}
}