//count：能輸入的數據總量
function Calculation(v,count) {
var span = $(v).next();
var valLength = $(v).val().length;
if (valLength > count) {
$(v).val($(v).val().substr(0,count));
valLength = count;
}
span.text("您已輸入" + valLength + "字元,還剩下" + (count - valLength) + "字元");
}