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/**
* @Description: 检测是否为数字
* @author cr
* @date 2020/4/18
* @time 12:01
*/
function isNumber(val: any): boolean {
const regPos = /^\d+(\.\d+)?$/; //非负浮点数
const regNeg = /^(-(([0-9]+\.[0-9]*[1-9][0-9]*)|([0-9]*[1-9][0-9]*\.[0-9]+)|([0-9]*[1-9][0-9]*)))$/; //负浮点数
return regPos.test(val) || regNeg.test(val);
}
/**
* @Description: 精度
* @author cr
* @date 2020/4/18
* @time 12:03
*/
function prefixZero(value: number, num: number): string {
let a, i;
a = value.toString();
const b = a.indexOf(".");
const c = a.length;
if (num === 0) {
if (b !== -1) {
a = a.substring(0, b);
}
} else {
/*如果没有小数点*/
if (b === -1) {
a = a + ".";
for (i = 1; i <= num; i++) {
a = a + "0";
}
} else {
/*有小数点，超出位数自动截取，否则补0*/
a = a.substring(0, b + num + 1);
for (i = c; i <= b + num; i++) {
a = a + "0";
}
}
}
return a;
}
/**
* @Description: 四舍五入
* @author cr
* @date 2020/4/18
* @time 12:02
*/
function roundFixed(num: any, fixed: number): string {
const pos = num.toString().indexOf(".");
const decimalPlaces = num.toString().length - pos - 1;
const _int = num * Math.pow(10, decimalPlaces);
const divisorOne = Math.pow(10, decimalPlaces - fixed);
const divisorTwo = Math.pow(10, fixed);
const value = Math.round(_int / divisorOne) / divisorTwo;
return prefixZero(value, fixed);
}
/**
* @Description: 保留小数位数
* @author cr
* @date 2020/4/18
* @time 12:01
*/
function toDecimal(value: any, decimal: number): string {
if (isNumber(value)) {
if (isNumber(decimal)) {
return roundFixed(value, decimal);
} else {
return value;
}
}
return "";
}
/**
* @Description: 加千分位
* @author cr
* @date 2020/4/18
* @time 12:12
*/
function executeLcommafy(val: string) {
if (!val || !isNumber(val)) {
return "";
}
if (isNumber(val)) {
val = val.toString();
}
if (/^.*\..*$/.test(val)) {
const pointIndex = val.lastIndexOf(".");
let intPart = val.substring(0, pointIndex);
const pointPart = val.substring(pointIndex + 1, val.length);
intPart = intPart + "";
const re = /(-?\d+)(\d{3})/;
while (re.test(intPart)) {
intPart = intPart.replace(re, "$1,$2");
}
val = intPart + "." + pointPart;
} else {
const re = /(-?\d+)(\d{3})/;
while (re.test(val)) {
val = val.replace(re, "$1,$2");
}
}
return val;
}
/**
* @Description: 千分位转换
* @author cr
* @date 2020/4/18
* @time 12:05
*/
function encode(value: any, decimal: number) {
let number = toDecimal(value, decimal);
number = executeLcommafy(number);
if (value === "" || (value == null && value !== 0)) {
return "";
}
return number;
}
const thousandBitConvert = (value: any, decimal: number) => {
return encode(value, decimal);
};
export default thousandBitConvert;