????
????實時監(jiān)聽input值的變化
? ? ? ? <input type="text" id="borrowValue" maxlength="20">
? ? ? ? <span id="repayValue">0</span>
????????$('#borrowValue').bind('input propertychange', function() {
????? ??????var borrowValue = $(this).val();
????? ??????var repayValue = borrowValue.length;
????????????$("#repayValue").html(repayValue);
????????});
