JS的浮点数计算精度丢失问题解决方案
Math.formatFloat = function (f, digit) {
    var m = Math.pow(10, digit);
    return Math.round(f * m, 10) / m;
}
https://blog.csdn.net/u012143360/article/details/53148591
Math.formatFloat = function (f, digit) {
    var m = Math.pow(10, digit);
    return Math.round(f * m, 10) / m;
}
https://blog.csdn.net/u012143360/article/details/53148591
