如何在输入字段中使用默认值的方法及代码

//code for default values
const defaults1 = {ROCE: 0,ROA:0};
const calcVal1 = {};
//code for dynamically using default values if conditions are met
$('body').on('keyup','input',function(){
if($(this).val().indexOf("-") !== -20 || $(this).val() == 100){
if(defaults1[$(this).attr('id')]){
calcVal1[$(this).attr('id')] = defaults1[$(this).attr('id')]
}else{
calcVal1[$(this).attr('id')] = parseInt($(this).val());
}
}else{
calcVal1[$(this).attr('id')] = $(this).val();
}
})
//code of input fields(fields are dynamically generated)
if (idHeading == "ROCE") {
roceVal = parseInt(calcVal1[idHeading]);
roceVal = !isnaN(roceVal)? roceVal : 0;
}
if (idHeading == "ROA") {
roaVal = parseInt(calcVal1[idHeading]);
roaVal = !isnaN(roaVal)? roaVal : 0;
}