found a lot of methods on the Internet, all of which did not take into account the negative number. It was found that the negative number did not add 1, and the reliable toFixed rewriting method was found
.Number.prototype.toFixed=function(s) {//toFixed
return (parseInt(this * Math.pow( 10, s ) + 0.5)/ Math.pow( 10, s )).toString();
}
let num = -2999033.45645;
num.toFixed(4);
//-2999033.4564 1
Number.prototype.toFixed=function(s) {//toFixed
const adjust = this >= 0 ? 0.5 : -0.5;
return (parseInt(this * Math.pow( 10, s ) + adjust)/ Math.pow( 10, s )).toString();
}
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