JS的toFixed方法设置小数点位数后再进行计算，数据出错问题

var blobTo = 409600;
var totalSize = 433927;
var percent = (blobTo / totalSize).toFixed(3) * 100;

percent // 94.39999999999999

var blobTo = 409600;
var totalSize = 433927;
var percent1 = (blobTo / totalSize);
var percent2 = (blobTo / totalSize).toFixed(3);
var percent3 = (blobTo / totalSize).toFixed(3) * 100;
var percent4 = (blobTo / totalSize).toFixed(3) * 1;
var percent5 = (blobTo / totalSize).toFixed(3) * 10;

console.log(percent1, typeof(percent1)); // 0.9439375747533572 "number"
console.log(percent2, typeof(percent2)); // 0.944 string
console.log(percent3, typeof(percent3)); // 94.39999999999999 "number"
console.log(percent4, typeof(percent4)); // 0.944 "number"
console.log(percent5, typeof(percent5)); // 9.44 "number"

var percent = (100* blobTo / totalSize).toFixed(1);

percent // 94.4