input 输入金额自动补上逗号

$(".inputElem").keyup(function(event){

            var txt = $(this).val();

            var keyCode = event.which;

            if ( txt.length<=0 ) {

                $("#fixval").hide();

            }else{

                if ( $.isNumeric(txt) !== true || keyCode==32 ){//判断输入类型，并去除空格

                    $(this).val( txt.slice(0,-1) );  //截掉非数字和空格

                    return false;

                }

                var re=/(?=(?!\b)(\d{3})+$)/g; //分割数字 1,000

                txt = txt.replace(re,",");

                $("#fixval").html(txt).show();

            }

             

             

        });