Question

vue 怎么将数据处理为三位有效数字，例如56432.12存为56400,423.21存为423,1.54存为1.54,0.25存为0.250

Answer 1

// 判断是否需要补零填充
function isFill(num, precision) {
    return !parseInt(num) && (precision >= String(num).length -1 )
}

function fn(num, precision) {
   const result = Number(num).toPrecision(precision)*10000/10000
   if(isFill(num, precision)) {
    return Number(result).toPrecision(precision)
   } else {
    return result;
   }
}

console.log(fn(56432.12, 3))
console.log(fn(0.12, 3))
console.log(fn(1.12, 3))