//?js小數(shù)加減乘除時精度修正
export?const?floatObj?=?function?()?{
????//加法
????function?add(a,b){
????????return?math.number(math.add(math.bignumber(a),?math.bignumber(b)))?;
????};
????//減法
????function?subtract(a,b){
????????return?math.number(math.subtract(math.bignumber(a),?math.bignumber(b)));
????};
????//?乘法
????function?multiply(a,b){
????????return??math.number(math.multiply(math.bignumber(a),?math.bignumber(b)));
????};
????//?除法
????function?divide(a,b){
????????let?num
????????a==0||b==0??num?=?0?:?num?=?math.number(math.divide(math.bignumber(a),?math.bignumber(b)));
????????return??num
????};
????//四舍五入并保留n位小數(shù)(isRound是否四舍五入)
????function?fomatFloat(num,n,isRound){???
????????var?f?=?parseFloat(num);
????????if(isNaN(f)){
????????????return?false;
????????}???
????????f?=?Math.round(num*Math.pow(10,?isRound?n:n+1))/Math.pow(10,?isRound?n:n+1);?//?n?冪???
????????var?s?=?f.toString();
????????var?rs?=?s.indexOf('.');
????????//判定如果是整數(shù)，增加小數(shù)點再補(bǔ)0
????????if(rs?<?0){
????????????rs?=?s.length;
????????????s?+=?'.';?
????????}
????????while(s.length?<=?rs?+?n){
????????????s?+=?'0';
????????}
????????let?_s?=?s.split(".")[0]?+?'.'?+?(s.split(".")[1].substr(0,n));????????
????????return?Number(isRound?s:_s);
????}????
????return?{
????add:?add,
????subtract:?subtract,
????multiply:?multiply,
????divide:?divide,
????fomatFloat
????}
}();
