保留3位小数

oninput="value=value.replace(/[^\d.]/g, '').replace(/\.{2,}/g, '.').replace('.', '$#$').replace(/\./g,'').replace('$#$', '.').replace(/^(\-)*(\d+)\.(\d\d\d).*$/, '$1$2.$3').replace(/^\./g, '');"

let value = cbiAmounts.value;

var temp = Number(value);

temp = Math.floor(temp * 1000) / 1000;

temp = temp.toFixed(3);