文本框限制輸入字數

        /**
         * 手機號、驗證碼輸入過濾
         */
        $('body').on('keydown','.uphone,.smscode,.icode',function (event) {
            var keyarr=[48,49,50,51,52,53,54,55,56,57,96,97,98,99,100,101,102,103,104,105,190,8],index=$.inArray(event.which,keyarr),len=$(this).val().length,mlen=$(this).prop('maxlength');
            if(index<0 || (event.which!=8 && len==mlen)) return false;
        });