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getFloat = function(number, n) {
n = n ? parseInt(n) : 0;
if(n <= 0) {
return Math.round(number);
}
number = Math.round(number * Math.pow(10, n)) / Math.pow(10, n); //四舍五入
number = Number(number).toFixed(n); //补足位数
return number;
};
console.log(getFloat('0', 4)); //0.0000
console.log(getFloat('2.08', 4)); //2.0800
console.log(getFloat('2.08500', 4)); //2.0850
console.log(getFloat('2.08996', 4)); //2.0900
console.log(getFloat('2.08994', 4)); //2.0899