string 工具

This commit is contained in:
leo
2019-07-12 18:21:33 +08:00
parent 1822f2dc2d
commit 6fe2f2d31e

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/**
* 数值格式化函数, 通过语义解析自动设置值的范围
* //整数
* 1:def(0)//显示一个默认值
*/
class StringFormat {
deal(value: number | string, format: string): string {
if (format === '') return value as string;
format = format.toLowerCase().trim();//不区分大小
let match_func = format.match(/^[a-z|A-Z]+/gi);//匹配到 format 中的 函数名
let match_num = format.match(/\d+$/gi); //匹配到 format 中的参数
let func: string = '';
let num: number;
let res: number | string = '';
if (match_func) func = match_func[0];
if (match_num) num = parseInt(match_num[0]);
if (typeof value == 'number') {
switch (func) {
case 'int': res = this.int(value); break;
case 'fix': res = this.fix(value, num); break;
case 'kmbt': res = this.KMBT(value); break;
case 'per': res = this.per(value, num); break;
case 'sep': res = this.sep(value); break;
default:
break;
}
} else {
switch (func) {
case 'limit': res = this.limit(value, num); break;
default:
break;
}
res = value;
}
return res as string;
}
//将数字按分号显示
private sep(value: number){
let num = Math.round(value).toString();
return num.replace(new RegExp('(\\d)(?=(\\d{3})+$)', 'ig'), "$1,");
}
//将数字按分显示 00:00 显示 ms制
private time_m(value: number) {
//todo
}
//将数字按秒显示 00:00:00 显示 ms制
private time_s(value: number) {
//todo
}
//将数字按 0:00:00:000 显示 ms制
private time_ms(value: number) {
//todo
}
//将时间戳显示为详细的内容
private timeStamp(value: number) {
//todo
return new Date(value).toString()
}
/** [value:int] 将取值0~1 变成 1~100,可以指定修饰的小数位数 */
private per(value: number, fd: number) {
return Math.round(value * 100).toFixed(fd);
}
/** [value:int] 将取值变成整数 */
private int(value: number) {
return Math.round(value);
}
/** [value:fix2]数值转换为小数*/
private fix(value: number, fd: number) {
return value.toFixed(fd)
}
/** [value:limit3]字符串长度限制 */
private limit(value: string, count: number) {
return value.substring(0, count);
}
/** 将数字缩短显示为KMBT单位 大写,目前只支持英文 */
private KMBT(value: number, lang: string = 'en') {
//10^4=万, 10^8=亿,10^12=兆,10^16=京,
let counts = [1000, 1000000, 1000000000, 1000000000000];
let units = ['','K', 'M', 'B', 'T'];
switch (lang) {
case 'zh':
//10^4=万, 10^8=亿,10^12=兆,10^16=京,
let counts = [10000, 100000000, 1000000000000, 10000000000000000];
let units = ['','万', '亿', '兆', '京'];
break;
default:
break;
}
return this.compressUnit(value, counts, units, 2);
}
//压缩任意单位的数字,后缀加上单位文字
private compressUnit(value, valueArr: number[], unitArr: string[], fixNum: number = 2): string {
let counts = valueArr;
let units = unitArr;
let res: string;
let index;
for (index = 0; index < counts.length; index++) {
const e = counts[index];
if (value < e) {
if (index > 0) {
res = (value / counts[index - 1]).toFixed(fixNum);
} else {
res = value.toFixed(0);
}
break;
}
}
return res + units[index];
}
}
/**格式化处理函数 */
export let StringFormatFunction = new StringFormat();